There was one thread here, probably a year ago can't really remember where one user reported his funds being locked due to exploiting something, when in reality what happened was that he indeed exploited something BUT the funds that were locked didn't exactly come from the exploit. Instead, the money he got from that exploit was used to play on something else, and he got really lucky, and he won a pretty sizeable amount iirc. The issue was resolved peacefully afaik, but I can't remember what the site was. The game was slots I think? My memory is failing me lmao.
The goud thing, though, is that the money used for gambling is supposed to be a money you can afford to lose and you are supposed to be aware of the risks involved.
On the other hand, I believe securing customers funds is mainly the responsibility of the casino. The least they can do is to have a hot/cold wallet setup. This way even if they get hacked most funds will remain safe and it won't result in their bankruptcy.
Still leaves a bad taste in one's mouth though. In any case, getting hacked always does that. Whether it's a big casino or us personally, just that in case of a third party holding our funds, we technically have someone to blame though afaik, most TOS indicates that they probably hold no responsibility for hacked funds, especially if the hack came from the user side themselves and not through their system.