Let me put it to you this way..... I have some serious connections and can get access to some really fucked up shit, physical and digital, pretty readily.
Even given all that, I don't think I could get my hands on CSAM if I wanted to pull a stunt like that. So that makes me think a few thoughts about the crowd that's so anti-public-meaning-public, and just so happens to have CSAM on hand (*cough* mastodon.art)
Maybe... just maybe... They're trying to hide child abuse?