Not that I would block them, since I think our users have the right to decide for themselves, but they are also highly radicalized.
The owner of that instance has on multiple occasions been ok with his users making calls to violence. See the link below of an example of one of their users making a call to violence which the owner of the instance defended and left up at the time (and this wasnt the first or last time)....very questionable instance sadly.
https://shitposter.club/objects/547c55f0-f50c-4105-8732-013e41c19a46
@boris_steipe
You can. Or make a second account on a more neutral server that isn't blocked by them.
Although it's hard to figure out which other servers would be a good fit this way because they have hidden their blocklist so you can't see which ones are safe to communicate with them. (Which is another red flag)
Oh, it looks like they don't allow new users at the moment. You can try mastodon.onlline or other similarly neutral non-themed servers.