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@ljrk @ulfi @sbb @chiraag @tortie @waeiski @Mer__edith
Signal also uploads the phone numbers in the contact books of a user's phone. Yes that's optional, but a very large number of users has it enabled. And yes, Signal makes an attempt to be privacy-friendly here by using Intel SGX, which means *they* can't access it, but Intel (and thereby likely the US gov) can.
This feature even affects non-Signal users and users that disable it, as they likely still show up on contact books of others.