Bitcoins have three useful qualities in a currency, according to The Economist in January 2015: they are "hard to earn, limited in supply and easy to verify". Economists define money as a store of value, a medium of exchange and a unit of account, and agree that bitcoin has some way to go to meet all these criteria.
One of the best transaction today is with the use of cryptocurrency because many people want to use the crypto or the bitcoin because it is faster to have a transaction and today there are a lot of people want to make bitcoin as the primary or secondary payment to the bills, services and other things with the support of crypto. As a person does not want to lose their money with the use of cryptocurrency we want to adopt the use of it but still, there are some country does not accept with the use of bitcoin or crypto as a payment still the adaptation of the bitcoin to the economy are still not supported to improve the economy.
Some usually say that Bitcoin or other decentralized cryptocurrencies don't have too many useful purposes. I bet when crypto becomes very useful some will scream that it's taking over the world and destroying their currencies.
Well, I think it should exist side by side with national currencies. If people decide to go for what is "really" safe and good for them, it will be immoral & unjust to prevent them from doing so.