I mean, if a business goal is to scam people they will never pay you out whether you win it legitimately or not. I never heard people make successful attempts at recovering their money from scam business, maybe if they want to sue or report them to police there will be investigation, but that's that. You can't really do anything which is why people never recommend you to spend the money you can't afford to lose and use new/unreliable platform.

If we're talking about reputable casino, I don't think they will intentionally witheld your winnings unless they make a huge mistake like what happened with Crypto sending $10m to someone. CMIIW. I think some of their excuses are kinda similar, check out the scam accusations board if you want to know more. Remember that most of them are self-reported so you'll need to verify them first.