I am sure many people gained a lot worth of money while playing in this very exciting cryptocurrency industry where huge opportunities and big risks collide...sometimes doing us some favor and sometimes also taking something from us. Through the years, I have had been exposed to scams, frauds and mistakes that in retrospect could have already made me rich at least in my country's standard. In my estimated, I think I lost at least $300K mostly in terms of potential earnings primarily because I let go of my 2 Bitcoin maybe around 5 years ago and made many mistakes (including getting into bad programs and projects) that cost me good amount of coins and tokens along the way.
Cryptocurrencies have a lot of potential, but it is risky to completely trust centralized exchanges (CEX) because, up to now, there are still CEX exchanges that have experienced hacking cases. Of course, they have lost a lot of money because the exchange had problems, suddenly closed, and no longer functioned. Their support contacts do not work well, and scams dictate short withdrawal times. For now, you should be careful when investing in cryptocurrencies, especially in CEX exchanges.