For the banks, it depends on your location, for fintech mobile wallet (banks) that serve in areas where casinos are saturated and not just sports betting platforms they would have some of those casinos available for direct deposits. But above all, the crypto is a sure banker for making deposits into our online casino account and you have already given some of those reasons.
With cryptocurrency and blockchain industry, you have much better option with open source and non custodial wallets. With such wallets, you have full control in broadcasting your transactions for deposits to any platform or to anyone. You don't have to rely on banks, platforms with maintenance and your transactions will be confirmed by miners but of course if you make a deposit to any centralized platform, you must wait for their credit to your account balance.
It's when you rely on a centralized platform while your main fund is still in your full control in your non custodial wallet. Maintenance on any platform can be quickly done smoothly or can trigger some technical issues, as users there is nothing to be sure that your fund is safe.