I recoginze pixiv from them hosting one the largest mastodon instance, pawoo. Which is widely blocked for child porn.

Wasn’t surprised reading the article on pixiv’s policy change:

The prohibited content includes (but is not limited to): “Sexual exploitation of a minor, incest, bestiality, rape (or any other non-consensual sexual behavior),” and “non-consensual mutilation of a person or body part.”

Oh the horror.