I got a response from the game provider, quote: "Hi may I help?".
Although I described everything to them that they have a problem in the game, I am ready to tell everything, I wrote my additional contacts.
Here, obviously, the guys have not yet encountered vulnerabilities in their games. Although they are already 4 years old, as they write.
This looks like an automated reply and it shows how unprofessional they are.
Did you check recently if the bug still exist and hasn't been fixed yet?
Some game providers choose not to respond to such messagges and play fool but they do fix the issue thinking that acknowledging it and that their codes are not perfect may harm their reputation and so they dont have to pay a bug bounty.