PR concerns about what puritans will think. Puritans love a nanny state with the entire modicum of affection their shrivelled black hearts can muster.
No, I'm not defending CSAM or AI simulacra of it. Fusing the medium with the censor is an abomination. It's Cocreator wagging the finger today, tomorrow it's Clippy popping up to tell me that what it thinks I might be making is too objectional for me to continue making it.