Also, donโt leave your account unused, delete it. User and follower numbers count.
And least as important, reply (if necessary to another corporate mail address) every email with Twitter/X in the footer, with a kind request to stop promoting and facilitating X.
That said, drawing a sexualized image of a fictional child is not child abuse, even if a machine does it. It lack the whole, you know, child being abused part that is kinda central to child abuse.
I get that, but the underlying detail is that for the "AI" to generate that, it most likely already saw it to begin with. Right-wing AI trained on child-porn, weird, i know, but it's this timeline.
Plus if users are prompting for that... perhaps as a platform you don't want those users.