Afaik, whenever an Activitypub instance has defederated from another it has always had to do with some combination of bad user behavior, poor moderation, and/or spam. Are the various instance admins who have decided to preemptively block threads.net simply convinced that these traits will be inevitable with it? Is it more of a symbolic move, because we all hate Meta? Or is the idea to just maintain a barrier (albeit a porous one) between us and the part of the Internet inhabited by our chuddy relatives?
(For my part, I’m working on setting up my own Lemmy and/or Pixelfed instance(s) and I do not currently intend to defederate.)
I’m wondering what they could possibly even Extend in a way that the Fediverse can’t keep up? The most they can do is to gatekeep people who are only in their ecosystem, but… they already do that. Whoever is only on Facebook and Instagram is only on Facebook and Instagram, and it didn’t stop the Fediverse from existing.