That’s a good question, and I used to wonder the same. A while ago, I started playing only at
licensed online casinos after getting burned by an unlicensed one that froze my account for no reason. Licensed platforms have to go through testing from independent agencies like eCOGRA or iTech Labs. They also use RNG certificates to prove the games aren’t rigged and must follow responsible gambling policies. It’s not a 100% guarantee, but it definitely reduces the risk.