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Yeah, I am in the same boat: I really don’t understand what the outrage is all about. First off, because Mastodon is built on open standards which are 100% intended to be interoperable. Second because everyone can read a Mastodon feed that isn’t private and the same goes for BlueSky accounts. Hell, BlueSky supports RSS for its feeds, so people with an RSS reader can follow BlueSky accounts without the user knowing about it.
Personally I do not trust the people behind BlueSky, but neither do I trust all the admins of Mastodon servers. There are a ton of questionable Mastodon servers out there, operated by people with very dubious motives, if not outright malicious intent.