@dazo Yes, it's nice in this regard. 90% of followers were moved within minutes. I'm still ~160 followers down, but they're being added as their servers respond, I guess. Some will never be moved as they probably no longer exist. It's a good cleanup, too.
I had to move everything else manually (via csv export/import). This could definitely be improved, I don't see a reason why it couldn't be moved automatically, too.