This would be an #interoperability rule that would require Twitter to adopt #Mastodon's approach to server-hopping: click a link to export the list of everyone who follows you on one server, click another link to upload that file to another server, and all your followers and followees are relocated to your new digs:
https://pluralistic.net/2022/12/23/semipermeable-membranes/#free-as-in-puppies
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