Cryptocurrencies promise decentralization and financial revolution, but many have turned out to be scammy. With little regulation, it's a breeding ground for fraud. The lack of transparency and accountability allows bad actors to exploit naive investors. Pump-and-dump schemes, vaporware projects, and exit scams are all too common. While blockchain has potential, the speculative nature and get-rich-quick mentality overshadow legitimate innovations. Always do thorough research and be cautious—if it sounds too good to be true, it probably is.