account migration

 account migration  (AKA account portability, or the ability to move your account ) is a specific kind of migration when a user switches from using one account on a particular server to using another account on another server, typically when both servers host multiple accounts, and has the common problem of losing followers.

Examples

 * Announced in 2022, Netflix allows users on a Family plan (or otherwise shared account) to migrate their user history, preferences, and general data to a new account. See their docs for step-by-step instructions: How to transfer a Profile to a new account

WebSub

 * WebSub - see subscription migration section

Mastodon
2023-02-23: How to Migrate From One Mastodon Server to Another By John Awa-abuon. You can change your Mastodon server after creating an account. Here's how.

History:
 * 2019-09-19 completed: https://github.com/mastodon/mastodon/issues/177#event-2648084970