Wasn't there a ruling where an AI art couldn't be copyrighted because it had no creator. So sucks if you make a game and then all your art assets get ripped for some other game.
The law is in flux. So until the legislature weighs in or a case reaches the higher courts that is a very real risk.
Imagine a hugely popular game found to have clearly unlicensed copyrighted works, even in only fragments. It could become expensive legally and in reputation. (Especially for big publishers and devs who may be seen to profit from unlicensed copies of work from starving artists.)
