Why do so many apps log users out after upgrading to a new phone ? (ex: Gmail, Slack, Instagram).
From a technical POV it's easy to keep the user logged in after a phone upgrade.
Is there any upside to logging the user out?
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How do I know it was the real user that upgraded the phone and not some one who shouldn't? That is the security and safety risk that exists in auto migration for accounts between devices. Hence, when a new device attempts to log into a service, the user must resupply their log in to use the service again. Read "Design For Safety", it will discuss these types of concerns that designers must grapple with.