We are really not 100 % sure that our Bitcoin investment will bring profit because there's still a little bit of risk involved in Bitcoin investment whether long-term investment or short-term investment, so therefore I agree that bitcoin may not give someone the huge returns that most people expect it to actually give them.
There's high risk involve in investing in Altcoin and should be avoided a lot of it are even scam created to manipulate people.
Bitcoin is only risky when you have in mind just to invest to make quick profit, so far as you have the understanding that Bitcoin investment is a long-term investment you will definitely get profit in hodling. You can also get a huge profit investing bitcoin using the DCA method in accumulating bitcoin. Just like in every investment, you invest money in it to give you a fine profit same as bitcoin which you need to accumulate bitcoin. Bitcoin investment is a profitable investment with huge profits so far as hodling is involve, you can't just invest just for a short time expecting to get huge profits, it doesn't work that way. Bitcoin is only risky for those who lack understanding and profitable for those who want to get rich quick.
Bitcoin investment is not a Ponzi scheme where it seems to be profitable by those who wants to get rich quick it is in Ponzi scheme that you will hear invest 10$ and get 20$ the next day, also you should understand that bitcoin investment is risky despite hodling for long or not thats why we are supposed to invest with the amount we won't be needing for a longer time, there is an advantage of accumulating Bitcoin and hodling for long we believe we will definitely make some profit in a long run because the price of Bitcoin early last year is not what it is now the price has increased massively so probably in 4 year time the price will above what it is now despite this too we shouldn't also see bitcoin investment as risk free investment.