[dredmorbius]

Any platform can wipe your account without notice, and so far as I'm aware, without meaningful legal recourse. Your only assurance against this is regular backups. There are tools you can use to automatically mirror your Mastodon / Fediverse accounts locally, as well as in-app content extraction tools.

Content migration isn't implemented yet, and as someone who's migrated a few times more than I can remember (three or four, possibly more), that's a bit of a PITA. But it is on the roadmap, and account migration in general has become far cleaner over the years, see note at bottom of:

<https://blog.joinmastodon.org/2019/06/how-to-migrate-from-on...>

I've been on the Fediverse since 2016, and in the several times I've migrated things have become far smoother.

At present you can migrate your followers, following, and blocked accounts:

<https://docs.joinmastodon.org/user/moving/>

Note that there are few if any proprietary / commercial services which afford anything remotely close to what Mastodon does, though blogging platforms probably permit import/export of content to a greater degree.