@TaraSkywalker As someone who's moved instances (and houses) more than a few times, not entirely true.
Mastodon migration is pretty good. But though you can migrate contacts (followers, blocks, mutes), you lose your content. In particular, follow-up replies to your earlier toots no longer reach you at the new instance. I've also seen older content of mine (e.g., this thread: https://mastodon.cloud/@dredmorbius/1058991, referenced from: https://toot.cat/@dredmorbius/107025098869569875) seem to have vanished of their origin instance.
Addressed just now by @lmorchard here: https://hackers.town/@lmorchard/110578561561286536