You seem to be missing my point.
This tool would not increase censorship.
Admins are already able to implement all censorship they want.
Admins are already able to block left-wing opinions, right-wing opinions, child porn, normal porn.
And that already happens.
Lots of instances (like feddit.de) block pornographic content.
Lots of instances (like lemmy.blahaj.zone) block right-wing content.
It is already possible, and it is already happening.
An AI which can detect CSAM (and potentially other content) won’t change that. It will simply make the admins’ job easier.
Riot Games behaves terribly?