Search and discovery are a big deal. It’s much less effort to find people and content, and to be found on Bluesky than on Mastodon/ActivityPub. It takes work on Mastodon, and I don’t think Pleroma, Misskey, and their forks are doing much better (though I believe Akkoma has a decent search function).
This is, in part because there is a very vocal contingent of ActivityPub users who do not want working search and discovery. I think that’s equivalent to saying they don’t want the network to gain mainstream popularity.
It does look like it’s possible to independently host all the components of the ATProto network now, so I’m hoping we’ll see a bunch of services pop up soon such that the network becomes more resistant to enshittification. I’ve seen Whitewind and Frontpage, but I don’t fully understand the federation model and haven’t been able to cause one to display posts from another.
I’m not going to make a very good case for a position I consider terribly misguided, but in short it’s because trolls on other platforms search for terms related to people they want to harass.
Some people have also raised objections centered around privacy or consent to process data. I find that misguided too; ActivityPub is radically public in that it sends every action to a bunch of other peoples’ computers, and there’s no explicit consent to do any of the other stuff a server might do with posts.
Of course any server owner can just
select * from statuses where text like '%search string%'
.