As a game dev I want to sell skins for Monero.
To be honest I expect it to be so so simple that there's no services required.
Just give every player a unique payment address. They pay to that address in monero and a view only wallet on the game server credits their account with 'gems' or whatever.
A fool could set this up with chatgpt instantly and I don't see that it needs improvement.
I'd be instantly suspicious of any 'service' in this space of trying to sell a nothing burger wrapped in financial language.
The only obvious gap is that the users have to have Monero already. This gap is solved by directing the user to convenient existing swaps and/or accepting traditional payments / bitcoins. This doesn't have to be gaming specific.
To be honest, I don't see why any game should be so 'privacy focused' anyway. Are people that ashamed of playing some porn game that they think their wife will search their bitcoin transaction history? I really value privacy for high stakes shit but not gaming even if I did like adult games lol
edit: oh its a gambling game lololol I think its better just trade perps like everyone else.