I read about a cryptocurrency hack recently where they were able to steal tens of millions of dollars.
With that kind of money involved, I'm surprised this doesn't happen often. Good thing that people are so honest.
You probably are new to crypto because it actually happens all the time to centralized exchanges not just to the person's wallet but also the poorly coded defi platform. So many hacking happened in the past probably some are not reported. There will be more that will happen later which you would suspect is a planned scam like an exchange or a casino claiming to be hacked but eventually shuts down and users don't get thier coins back.