How does someone go about reporting a bug to a casino a still hold casino accountable to pay a bounty?
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.
In our forum, there are several reports about a user claiming that they haven't paid for the bugs that they find despite of the site having a bug bounty. If they don't like the report, they can always reply and explain, not that they ignore the message or they just "seen" it.
We don't know though, maybe they are only talking advantage of it for free. Then there is that platforms who don't put a bug bounty message but if we inquire them, they are glad to offer some incentives. I think they have a reason for this like they don't want the public to know that their site is buggy, as they are afraid that someone can take advantage of it personally.