You have done a great job by reporting the bug to the support team of the casino. If they find the bug as harmful then surely they'll compensate you for it and even if they don't that's still okay because you have done a great job anyway. I would recommend you to wait for their response if they're a reputed casino then you'll surely get some reward for reporting of that bug. It's not always necessary for a casino to run a bug bounty program but if someone finds a bug and reports it to a casino then in most cases casino appreciate that favor and reward such person with some money.