21
Mastodon's decentralized social network has a major CSAM problem | Engadget
(www.engadget.com)
This is a most excellent place for technology news and articles.
The researchers are looking at actual posts on actual servers. The research itself is not made up. The speculation and handwaving that the tech press feels the need to introduce into it? That's made up.
As for why would anyone use Mastodon for it — your typical Internet pedophile isn't any smarter than your typical Internet user, and half of those are below average.