How many people are rich because of crypto?

I'm curious, how many individuals have truly become wealthy through cryptocurrencies? I understand that there are numerous stories of overnight millionaires, but how prevalent is this really? And among those who have become wealthy, what percentage do you think are still holding on to their crypto investments, versus those who have cashed out and moved on to other investments? Also, given the volatile nature of the crypto market, how do you advise investors to balance risk and reward when considering crypto as a wealth-building tool? Finally, with so many different cryptocurrencies out there, how does one determine which ones have the potential to generate significant returns?