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It is not advisable to leave their money in the casino because we don't know what can happen, but some people still keep their money there. Maybe if the amount is not big, it will be fine, but it can be a risk for us if it is big. But we can hope the casino will guard its site against hacking and always monitor it for possible attacks from hackers. It's even possible that gambling sites can make some bug finder for anyone who finds a bug on their site so that the casino can reward those who find it.
Well perhaps leaving your crypto on a gambling casino wallet is still good for a short period of time like a day or weeks, beyond that --that is too risky.
Because it will perhaps the fees will consume all your balance if after a session per day you will withdraw your crypto asset on the gambling casino because you obsess about the hack or losing your fund. But for me, as long as the gambling casino did not have a serious complaint regarding the financial system it is good to leave money and all of this were depend on their reputation.