There is a use case for AI , only trained within an IP, provided its not licensed for generic use, and the artists are compensated. To speed up an animation cycle. Improve effects. Then the artists will need to work on refinishing. Removing excess fingers. Incorrect lighting.

Take,Avatar2 I see a bad looking video game with unreal shapes for muscles and unreal color and flat lighting. The use case here would be license illustrators work from marvel, or different cartoons from different eras for different characters Or the beautiful inking from Ultimate books