A large part of their movement is based on aesthetics. And csam is probably a bridge too far for them. It just looks ugly. But I have no doubt many of them don't care about that either.
But from the blackmail angle, the public image of a sick pedo is not compatible with the orange man's public facing persona and his narcissism would make him the perfect blackmail target
There are small language models out there that can run fluently on smartphones. I'm fond of StableCode as a coding tutor. My dream is to be able to speak to the tutor and see its code instructions without having to dig my phone out.