Of course, even though we can only stare at our assets on the screen because they hold custody, we're still somewhat secure, especially if they don't mess with our funds. However, if the platform is robust, user funds can still be safe if they're hacked because they're bound by regulations, unless they collapse/go bankrupt, as in the past cases of FTX or Mt. Gox.
And a lot of cases have happened, and that is one one of the things people need to start with is the security of your assets because that way you will know that whatever happens is your fault, because if it's in your custody, then it is meant to be safe compared to when it's on an exchange. We all should know the risk behind that because it is clear not your keys, not your coin. The case of FTX is a huge one.
And what that sometimes infuriates users is cases of access restrictions and delays in large withdrawals to their bank accounts, citing the classic excuse of suspicious activity being detected, even though the withdrawals were made to accounts in their own names.
A lot of things, and these guys are always looking for ways to steal from people, and when you tell them to go for knowledge, they think it's all a joke, and they should understand that knowledge acquisition is not only for learning but also for asset security. When things go wrong, you will undoubtedly suspect a wide range of actions, which is simply the reality.