losing followers

 losing followers  is a common problem when a user migrates their account from one server or service to another, either when the original server does not support forwarding (like HTTP redirection), or in systems/protocols that reverse the typical reader-subscribes-to-publisher-model to a publisher-delivers-to-reader-inbox model, which lacks a way for a publisher account to notify inboxes that they should accept delivery from a different address.

WebSub
WebSub has a solution to subscription migration (essentially follower migration, so you as a WebSub publisher/notifier don’t lose subscribers/followers)