https://archive.is/KW3dX

"Twitter rival Mastodon rife with child-abuse material, study finds"

Two things:

1. partway through they consider [japanese loli/AI CG] to be "abuse materials". Even if you find it highly objectionable material, because you've conflated the two I don't actually know what you're talking about when you say there's a lot of "it". Also while this stuff gets challenged at the state level it's a first amendment issue in the USA whether you like it or not. some of these servers are hosted in the USA so singling out Japan's laws seems stupid.
2. Try getting access to the CSAM fingerprinting service. I know two different people who have tried in good faith and the service refused them. You can't criticize people for not doing enough when you gatekeep them from the tools you let big companies use.