For a lot of procgen content, i believe the individual assets or comprising components are still handcrafted, it's just the placement of them that is done procedurally. But video game copyright is actually pretty complex (in theory; somewhat in practice, too, but much more answerable) so I'm not sure, assuming a fully genAI set of assets and their placement, how this would pan out. I suppose those components would need to be identified for limitations on the copyright under current filing guidelines, but there is still a whole lot in the game that is protected.