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 think you’re mistaken, as far as I understand, any server that federates with your home lemmy instance has access to what posts/comments you’ve up/downvoted: https://lemmy.world/comment/704895
This by itself makes it very easy for “malicious” server operators to profile users.
kbin makes it very clear through the
/votes/up/votes/downpages attached to each post/comment - lemmy doesn’t show this information in the UI, but you can get it easily by federating your own server with the instance of the user you want to profile.Agree with the rest.