If you move you lose your history and relationships behind. There is no migration, same as Mastodon. On purpose so as not to disempower instance owners
It's an open source project. Anybody can fork it and create a separate and incompatible network. What they're is, is lack of interest in allowing frictionless for the users. Which would streamline onboarding.
This long standing issue, which has been closed before, most be completed before the users can sign-up without worry what their instance owners thinks.