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Mastodon's official stance on Threads
(blog.joinmastodon.org)
This is a most excellent place for technology news and articles.
The one thing that you can trust 100% in all of this is that Meta's intentions are evil, because Meta's intentions are always evil. They see a new community finding its footing as prey to be seduced with features and then slaughtered for profit. They meet leaders behind closed doors and make them sign NDAs. Next, they'll start throwing around their unlimited resources to take over.
Immediate and universal defederation is the only answer. It's the only defense.