Yes because it's another form of banking, and even if your government doesn't tell you to keep your money on a gambling website you can proceed and do the same, because it's your money.
How can someone be so stupid that they decide to keep their money on a gambling web-site? Do you not know that it's even a risk depositing your fund on a gambling website? There are many fake casinos out there waiting for a convenient time to rug people of their money and you want to turn them into a bank?
You are free to do such because it's your money, if you believe that casinos are safer than your bank then good luck, as for me it's the stupidest thing I've ever heard of, the name casino even sounds a red alert to me because I know they are in for the business of making money, so anything is possible.
You don't have to be told that this will cost you a lot if care isn't applied to this, it's your money so you are free to keep them wherever you believe they will be safer.
Your level of sarcasm got me at first and I understand how you were quick to change tune, but it is traditional that gamblers do all the time especially the ones that do this as their hobby every day, it might be a work load to be doing deposits and withdrawals all the time. However, nothing secure beat personal saving, gambling platforms are not like banks that commercial banks can be traced and fine, if a gambler decide not show up again, I'm not sure if there is going to be a compensation from anywhere even if the government licence the casino.
Money does not belong to you if you do not have control over it. You are mistaken if you think you can trust someone with your money. If you can leave your money on a gaming website, that means that the gambling website is in charge of it and you are not. Your money will be lost along with the gambling website if anything were to happen. No gambling site is too big to be hacked, and nobody is promising you a refund if something bad occurs to the gambling site. It's not a good idea to save money on your gambling website because that's not why they are created.
There's a saying in crypto if it's not your
wallet, then it's not your bitcoin. as simple as that because they all have the means to control the funds on their exchanges. As for gambling sites, I think they will simply use your money to pay for others because they don't have any problem making you see the amount you have in your account while they actually using it on their sites. But the problem is when they run into some serious problem they need to close their site temporarily and don't have any exact time to make it available for their users again. honestly, you won't be having any piece when that happens because most of those scenarios are not real because what is real is, that they are just running away with your money.
It is actually the keys and not the wallet. You can control a wallet without having the private key, like the centralized exchange and custodian wallets, you can control it but what you don't control is the private keys and who don't control private key controls nothing, and the day they disappear is the day you lose everything. FTX is a perfect example of how to picture the wallet and the private key differences; when the exchange turns out scammed, many have a wallet where money was kept but didn't control the private keys and till today, nothing is returned to the affected victims.
I wish there is a best way to treat the casino and way to handle funds but there aren't any, the best to do this is to play with the amount you want to wager, deposit the amount, try your luck and after the process and the fun, take it out and to the external wallet and if the next day, you feel like playing again, you can repeat the process again. It is safe this way to think that you have your money in your wallet.