Lemmygrad seems to be a bit of a target of defederation by many instances, and there’s probably some history there that I’m not aware

a number of Lemmygrad users conducted a "special military operation to denazify" lemmyml, beehaw, sopuli and the Lemmyverse. Some of the history is here https://lemmy.ca/c/fediverselore. They are credited with putting down wolfballs, an actual alt-right instance to their credit. Some of the conflict very loosely spread to github.

Some senior lemmygrad members have a long history of hostility with PrivacyGuides, see the post here and iirc some on [email protected]