Mastodon users are really not happy that there's an alternative that might actually give users data sovereignty, wresting power away from people whose only way of relating to others is by exerting control over them.

Can you explain the differences in the “data sovereignty” story that bluesky does better than Mastodon?

I never see these discussions on bluesky or mastodon only here on Hacker News but it almost is never elaborated just that bluesky’s is better.