Going to play devil's advocate here.
Bluesky is just...better than any Fediverse microblogging platform. In terms of UI, discoverability, and keeping a balance of users in the community.
Mastodon sucks for regular people. And none of the other better platforms like Firefish ever gain enough steam to beat Mastodon because of existing issues in the structure of the Fediverse and ActivityPub (this also includes Mastodon itself to an extent).