I'm not saying that because I think all derivative creativity is lesser than 'original' creativity. Rather, we've gotten so used to such broad protections on all creativity that a good chunk of us genuinely think that their dozens of minor variations on a popular prompt entirely spat out by a tool and published to a site every hour are at the same level of creativity as something even just partially drawn by a person (eg characters drawn into an AI generated background or AI generated character designs then further fixed up).
The vast majority of AI art I've seen on sites like Pixiv has been 'generic' to the level of the 'artist' being completely indistinguishable from any other AI-using 'artist'. There has been very little of the sort where the AI seemed to truly just be a tool and there was enough uniqueness to the result that it was easy to guess who the creator was. The former is definitely less creative than the latter.