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https://www.bleepingcomputer.com/news/software/signal-tests-usernames-that-keep-your-phone-number-private/
https://www.bleepingcomputer.com/news/software/signal-tests-usernames-that-keep-your-phone-number-private/
They could just make it opt-in, no?
"New device X has logged in to your account. Do you want to transfer existing history on this device to it?"