Before reporting a bug in a casino, it's important to check whether they have a bug bounty program in place. If they don't, it's unlikely that they will reward you for finding a bug and they may even ignore who reports it so it's up to you if you still want to report that bug. You can ask them beforehand if they offer any credits for reporting bugs. If they do, then you should cooperate with them and assist them in fixing the bug. Once the bug is fixed, you can expect to receive your reward if there is one.