1. Instead of being blocked or shadowbanned by Elon Musk, you can now be blocked or shadowbanned by the Mastodon instance admin. 2. Making connections with other Mastodon instances is non-trivial. 3. Exporting your data and connections is not supported on all Mastodon instances.
Why aren't more people switch over to Nostr? I know Nostr has seen “meteoric” growth [1] and it's easy to find your old twitter contracts again [2] but somehow Hacker News is very quiet about this open protocol and all the various clients and implementations [3].
[1]. https://stats.nostr.band/
[2]. By using tools like https://www.nostr.directory/
[3]. https://nostr.how/