How is training AI on imagery from the internet without permission different than decades of film and game artists borrowing H. R. Giger's style for alien technology?[1]
How is it different from decades of professional and amateur artists using the characteristic big-eyed manga/anime look without getting permission from Osamu Tezuka?
Copyright law doesn't cover general "style". Try to imagine the minefield that would exist if it were changed to work that way.
[1] No, I don't mean Alien, or other works that actually involved Giger himself.
We don’t need to “try to imagine”, we just need to wait a bit and watch Walt’s reanimated corpse and army of undead lawyers come out swinging for those “mice in the general style of Mickey Mouse”.
Intellectual property generally includes copyright, patents, trademark, and trade secrets, though there are broader claims such as likeness, celebrity rights, moral rights (e.g., droit d'auteur in French/EU law), and probably a few others since I began writing this comment (the scope seems to be increasing, generally).
I suspect you intended to distinguish trademark and copyright.