I don't see any copyright claims, or trademarks when I start the game. There is his logo, there is warning about epileptic seizures, after that warning about game being 18+...
Like I said, I am not a lawyer, but what exactly he can copyright? RenPy which is released under few dozen of open source licenses, some very restrictive? Daz models? He would have to buy copyright from them. Not to buy models, but copyright...
Text? It's coded into renpy, and can't be copyrighted...
As for buying services... maybe he did, maybe he didn't. It doesn't mean there is any legal basis for him or them to claim dmca.