One could easily argue daytraders make a ton of money by flipping coins for smaller profits. That is certainly a valid approach to things, but it doesnt work for everyone. On the other hand, a lot of people buy cryptocurrency and hold onto it for as long as possible. This means they need to be rather patient when it comes to volatility in the price. Unlike what most people believe these days, gains and losses can occur at any given moment of every single day.
If we are super super lucky then yes we can be rich within a night but this happens very very rare and while holding lots of coins to become maybe a millionaire which is 99.99% impossible.
At the other side there are people that are holding for a long time maybe 8+ years and still believe that bitcoin will go to 20k again which I think is not possible for at least few years.