I think that they are extremist left-wing users who create a lot of spam in many different comment threads, because of their tendency to spam and attack other users I think they should be avoided and instance admins should either block their instance or at the very least block a majority of the users posting this kind of spam (since it’s most of their active users I think blocking the Instance would be Easier IMO).
Sounds like you want a Distributed/Decentralized service like Nostr instead of a Federated service like Lemmy, you should join there instead, I’m sure you’d be right at home there.