Folks who're annoyed about the inability to move to another instance without being able to take your followers with you:
"Account migration" has been a feature request on the Github issue list for quite a long time. https://github.com/tootsuite/mastodon/issues/177
It is a BIG job, but it is on the list and the devs are aware of it. It could take a long time.
Clicking through to the issue on Github and clicking "thumbs-up" and leaving a comment about your suboptimal new-user experience is really helpful.
@RyanStates @chuckwendig Well, I do think it is a concern for existing community members *and* new members, and it does make things a lot harder. Like, a friend just asked me on Twitter if it would be bad to find out later that they'd picked the "wrong" instance, and I'm like... yeah, actually, moving is not easy and you can't take your toots and followers with you. It's not great!
@cassolotl I hear from the grapevine that account redirection (i.e. account A points to account B in some obvious way) is on the roadmap for the next version ^^; Not sure what form it will take, though.