Bluesky's marketing is rather annoying on my opinion. They're not defederated in practice and they probably never will be, but that's okay. People don't want a new Mastodon, they want a new Twitter after Musk fucked that up worse than ever.
Their promises of portability may ring empty but so far their lack of AI algorithm and ad feeds are what people actually come to Bluesky for
If you want federation, ActivityPub is there and ready to go. You could probably hack together a bidirectional Bluesky <-> Mastodon bridge without too much effort (requiring an account on BS to post from Mastodon) and enjoy the portability of your main account while also being able to follow your friends and such on BS.
Their promises of portability may ring empty but so far their lack of AI algorithm and ad feeds are what people actually come to Bluesky for
If you want federation, ActivityPub is there and ready to go. You could probably hack together a bidirectional Bluesky <-> Mastodon bridge without too much effort (requiring an account on BS to post from Mastodon) and enjoy the portability of your main account while also being able to follow your friends and such on BS.