Most Casinos will only accept a report if it has a viable security impact with a PoC and not a general report from a scanner tool.
I'd recommend asking the casino if they have a private bug-bounty program either internally or externally (i.e, operated by BugCrowd, HackerOne, intigriti)
I think if you follow the thread you will read all what OP wanted to elaborate here because he had given everything and even telling the people here what had happened and his only demand is at least a THANK YOU for what have he done for the team , take not the Money because we all need this at appreciation for what have you done good is for me a better giving here.
Sorry for the heads up on this one but i cant really just that easily accept that someone who do found a bug would really be just liking to have or get some THANKS.
Of course you would really be expecting something for some bounty based up on what you have found. The sad part when you do find an exploit which even if you do saw that its a major
one, you dont really receive any something in return but well they could really be able just simply tell you that the bug you have found is really just that minimal or something that critical.
Is there something you can do? of course none.