You can easily host your own instance with a simple docker stack.

I dont know of any public instances except the main but I also havent searched.

Link unfortunately dead by now…

I joined Bluesky in december. Many of my favourite artists even have accounts there. They just aren’t that active. Same with Misskey.

The only problem I have with x alternatives currently (both Bluesky and Mastodon) is that my favourite r34 artists havent really switched plattforms :(