Even if you don’t want to consider it CSAM, it is, at the very least, sexual harassment. The kids making and circulating these pictures and videos should be facing consequences. And the fear of consequences does offer some degree of protection at least.
If they distribute the drawing, yes. And the difference is that a drawing is immediately recognisable as a drawing, but an AI generated image or video isn’t necessarily easily recognisable as not being real, so the social consequences for the person depicted can be much worse.