My guy, the instance run by Lemmy’s lead dev is explicitly a marxist leninist instance, and that pretty much just means they tolerate and encourage tankies. There’s more than one community on other instances recording all of the people who have been banned from the instance for daring to call it out. I believe the lead dev also runs the Lemmygrad instance, which is explicitly tankie. Hexbear is very tankie as well, and used to brigade frequently (they’ve finally started to calm down recently).

And those are only the “surface level” tankie instances that are well known and haven’t been blanket defederated by everyone.