In my opinion banks and crypto currencies both have their important role ,
I personally consider bitcoins as investment , i would rather pay for things with fiat that with my assets , at the rate BTC is growing it would be like overpaying for every stuff we buy with them , so for daily activities and needs i would prefer paying from fiats , yes they have taxes in every transaction but agree or not taxes are very important source of income for any government to function and maintain the country.

The major reason could be the social media post and topics of crypto being legal or not in the press / news , since its neither legal nor illegal in many countries people get fluxed and when in news they see that the media states its nor legal and undershadow neither illegal people might get more confused ,
People have set their own margins till where they would hold and would retract once they reach if they are close to the margin and the news spreads that the bubble would burst they all would just   ignore and remove their assets  fearing of losses .

Not just the small community but we see that El Salvador which adopted bitcoins as legal tender also is helping and hoping that bitcoins would help them boost their prickliest economy where 1/5th of their GDP   came from people sending money from abroad , this transaction had high transaction fees since there are few banks and the money would be considered in international exchange ,
The country was paying a huge amount in transaction cost and less than 35% of the whole population had bank accounts,
It is said that every citizen were offered $30 which they could use for paying at shops or government taxes .

We see here one of the main reason for adopting could  be elimination of transaction fees in international transfer of money .

if I was certain the that the market wont go up in near future I would just invest in any other crypto by studying them , I know most of the crypto currencies have a similar graph but if we carefully study we would find some which would hold or get a little bullish , holding BTC would also be an option but if we can make profit by just trading it we can always buy them back after we make more by trading .
there are many apps which allow crypto currency exchange with other crypto currency exchange without any transaction fees , just head into one then analyze the crypto and invest with your holdings .
high risk even higher reward 

well obviously ads have their own commercial purpose of course but  in India, their government already have been promoting online payments and online money transfers using UPI with apps like paytm , PayPal and other wallets from start of 2019, they promoted online banking to such an instant where people are no more in queues for transferring money in banks

with the campaign for promoting online payments it slowly shifted to make more people into stocks , and the results were very surprising , although it wasn't governments efforts but the advertisements helped average  people notice the importance of investments who weren't aware at the moment and with this step taken now the companies are popping with ads to invest in crypto and its not just about ads in sports  almost every channels are getting these ads, this may have positive effect on the crypto as more and more people will join so in my opinion it is not wise to say that cryptos wont be affected .

To a fresh newbie it is very hard to explain a topic like crypto , how they are issued , the decentralized nature , what effects the value , how to trade using the fluctuating value , the transaction fees and many more  things , for explaining  that to a newbie we must have our own concepts clear about legality because its the most asked question , well if someone just wants to invest they should not need to know about the microtransactions using blockchain , just briefing is enough ,

I guess showing off on social media of your assets , possessions and confidential information  is never safe and would attract unnecessary attention ,
but if instead of showing the possession of bitcoins if he had posted for any other asset or gold it would have attracted some attention too , I just wanna add that people should be responsible about the stuff they share on the internet and be more careful and cautious .

we know that bitcoins is digital decentralized crypto currency which mean its unregulated and we also know that the value fluctuates a lot , which makes it a high risk high reward asset ,
Although the returns on investing in cryptos are astonishing high but we can  never be sure about cryptos crashing , the chances are low but they aren't that low to be ignored , the value highly depends on the supply and demand ,
I don't think many retail investors and asset managers would opt crypto for big amounts considering the risk , but for traders they can just invest in any other crypto which is more stable and are regulated .
 

well it is true that of all the 21 million BTC that can be mined we have already mined 18.87 million , with 900 estimated to be an average number that are mined per day .
we believe that all of the BTC could be mined till 2140 , this is assumed by calculating the block rewards for  miners which is halved every 4 years, it was 50 bitcoins In 2012,then halved to 25 bitcoins, and it went down to 12.5 in 2016 and in may 2020 its 6.25 for every new block .

now when Bitcoin reaches its supply cap, the block rewards that the minders used to get  will vanish, and miners will depend on fees from transactions on the cryptocurrency's network for revenue , this may cause increase in transaction fees.

if I would give a suggestion it would be to study and understating the crypto market  , then after thoroughly doing your own research or asking some professionals in crypto trading start inter crypto trade  with half of you BTC, well bitcoins aren't the only digital crypto currency that is growing , there are many altcoins also ,
although bitcoins are growing but altcoins are being promotes as well , for example we saw the rose of DOGE and Ripple
the returns on DOGE and from March 2021 to May 2021 were 1400% more than bitcoins.   

my country is still under development stage  , now internet and mobiles are available everywhere but along with that people should also have knowledge to use crypto  , since its not accepted by any merchants & businesses people like to hold , yet if it was accepted  I don't see why would people buy something off bitcoins , yeah it is a currency but the fluctuating value made it one of the best asset , and you don't just go buy something off your assets .

the reason might be that the young generation  have more knowledge about digital environment , digital currencies and understand the functioning of blockchain based crypto , they are more openminded and willing to change ,
plus investing in bitcoins are less hectic and comparatively easier to invest in as compared to stocks or other investments which require regulatory procedures .

now in most of the countries people  below age 18 cannot have  a bank account but if they want to start trading they can  just borrow some from parents and invest in any crypto without and hassle .
 

when it comes to acceptance , yeah bitcoins have been getting more and more  accepted by many businesses and tech giants , but still there is a long way to go when we are referring to acceptance by  countries , as of now only one nations has considered bitcoins as a legal tender , rest all are just using wait and observer approach ,


now if we talk about legalizing , most of the countries haven't legalized , they have just not clearly determined the legality , its in a flux state neither legal nor illegal .


the demand and use of BTC by the investors and users have more effect on bitcoins than those who say it would crash  .

you should do your own research dude why would you want to trust any stranger advising you to invest your money ,
I get it you are new but if you keep relying on others advices you wont learn anything by yourself , yeah learning from others mistakes are an op way of progressing but you have to start researching and start investing on the basis of your own research , in investment and trading you can go ask advices but not the whole thing that where to invest .

from my own viewpoint I don't consider cryptocurrencies as a social movement I mean yeah government cant have taxes on transaction and we have full control over our earnings and holding , yet
mostly people are supporting bitcoins because of the asset it has become , the returns on investing in Bitcoins are by far the most profitable ,
I believe this world is a profit based ecosystem , everyone is making profit by investing in crypto even big tech giants like Microsoft , tesla 

as far as organization its a decentralized crypto and we the users are the organization , with the demand and use the value vary.

gold an bitcoins both have been a great asset with best profits for many people,
if we talk about superiority in terms of legality and accessibility gold is the clear winner it is accessible to people of all economic standing and technological knowledge , its legality cannot be questions as  country's currency or paper money has a value directly linked to gold. 
but if we just consider them both as an asset Bitcoins would make its stand .

that might not  be the reason why governments aren't showing interest in crypto , well  scams are not new and there are way many scams in normal fiats published by the country ,
we cannot say that a currency is bad just because a scammer used  it to scam someone
there are more reasons like the decentralized nature or the fluctuating value but no this for a government to fear crypto or to avoid it .

While investing is stocks people are directly getting involved and investing in a company that they think might grow and be profitable , they are regulated by government and hence are legal ,
but if we see crypto its basically just a digital asset which are mostly unregulated due to its decentralized nature , they are accepted as legal tender in only one nation and most of the countries are observing and are confused between the legality of crypto , plus online stock exchanging are around from 1970s with roots  starting from 1600s , before cryptocurrencies , stock was the biggest profit making asset.
plus stock being legal might be the major reason behind your query.

Just see the profit and return of holding Bitcoins , don't we all know a guy who spended Bitcoins for some pizza?
Yeah the value are too much inflated as compared to the older days , imagine we buy something with Bitcoins today and the value increases then we would be just overpaying  for the services or good we buy , or take it this way if someone runs a business would they be accepting Bitcoins when the bubble forms and is about to burst? Would they be willing to risk that the value of Bitcoin would be going to get higher and accept huge payments? .

I personally believe that Bitcoins have developed  to such an extent that majority of the people use them as an asset rather than using them as a currency,

its true unless institution start investing , with institute level investing they literally can buy huge amounts resulting in market value manipulation ,   
although we are free to hold our shares but we should not forget that if the institution cannot buy they would simply start mining for more ,
even we can mine but the question is how much , obviously with the funds they have they would have better mining rigs and in a large number and who knows how much more it is to be mined.