inclementimmigrantOwlcat is using generative AI for The Expanse Osiris Reborn, but the final game will be "100% human made"
Upside, so if these guys use AI to create assets or code, none of that can be copyrighted currently under the law. Therefore if it’s not copyrightable then pirating the game and using those assets in other games is perfectly fine.
The game containing public domain images wouldn’t make the entire game public domain. Someone with a copy of the game could distribute those particular assets though. Maybe. It depends on how much human effort was involved; an AI image can become copyrightable if enough effort was done to transform it after it was generated.