The anime thing can still be illegal if its depicting a minor, or what looks like a minor in a sexual way, in various jurisdictions. Honestly sounds like a nightmare to moderate.

My point is that "CSAM in platform" claims often refers to those contents(despite the fact that this tactic in practice results in special carve outs and tried-and-tested legitimacy and free additional popularity for those contents, with hilarity), not necessarily that those ought to be legal(though that kind of is my stance).