@jellyfriend @puniko originally hosted by the huge Japanese art website Pixiv with accounts offered for all of their users, Pawoo was one of the biggest instances running Mastodon on Fedi.

Due to the above it mostly hosted Japanese speakers and featured manga art posts near exclusively. And because Japan isn't the west they also had a large number of posts of the kind westerns are uncomfortable with, mostly girls and boys who look too young in situations they really shouldn't be in.

Later Pixiv sold the instance to a hentai publisher which only exasperated the issue, and then it was sold again, and now it's gone.