Good to know.
Strangely, people don’t seem to mind.
I guess then a key difference is that Bluesky is presented to 𝕏 users as the same kind of monolith as 𝕏 whereas Mastodon is presented to them as a huge number of instances from which they absolutely have to pick one.
My point is that not everything in the Fediverse is public. Unlike what Mastodon and Lemmy users keep claiming because that’s all they know.