Imagine a world without platform lock-in, where no ban or billionaire could take down your social network. That’s what ActivityPub has planned.
Popular pieces of software that’s part of the fediverse usually give you either:
- Export options - manual export options intended for GDPR-Compliance and peace of mind
- Account Move options - Mastodon is best known for this, as you can migrate your profile (but not your posts and followers) to another instance. Anyone which then visits your old page will have it blurred out, linking to your new one.
#2 could be expanded in the case of Kbin and Lemmy to also include subscribed communities/magazines, settings and some other things where Federation allows for it.