@kissane so, data migration works waaaaaaay better on the Web if you own your own domain.
I'd compare moving your WordPress blog from one service to another.
You download the data, upload it to the new installation, change the DNS, and shit just works.
@kissane
You can do about the same thing with a single-user Mastodon instance right now.
It would be cool if you could do it with other server software: make a backup from your 1-user Masto, and restore it to your 1-user Calckey. Change the DNS, and it just works.