Most of the instances I’m seeing discussed on X are not “fictional depiction of nonexistent child” but instead “minor’s posted photo directly replied to with ‘grok, put her in a bikini covered in ‘donut glaze’’”, which, in my opinion, crosses moral bounds far beyond the scope of your theoretical lab-grown work of fiction

Many territories prosecute for simulated sexual abuse of children, including drawn images. Most consider it obscene beyond simulated murder.

Killing people in a game isn't a crime.

Producing and disseminating CSAM (whether it's physical or digital copies) is a crime.