There are tool to export and import subs and blocks but as far as I’m aware at the moment there is no account transfer utility yet.

I think users are jumping over to instances that more fit their personal values. Its why I left lemmy.world and created unilem.org. An instance for no defederation. It might not be for everyone. But i prefer to be able to access everything in one place and do thr moderation/blocking on the user level.