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A better list of Mastodon servers that have pre-emptively defederated from Threads.net
(fedipact.veganism.social)
This is a most excellent place for technology news and articles.
I'm not signing up for Threads, but looking at some of the stuff other people show me coming out of there, it might end up just being yet-another-nazi-instance when they open up federation so might just end up getting blocked on those terms and not so much the "being meta/facebook" terms.