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OWS never claim that Signal provides anonymity. The word they use is privacy which sometimes involves being anonymous, but not necessarily so.

> Wasn't whatsapp all over the news for its "replace the encryption key transparently without notifying the user" feature ? Also facebook.

Which was a conscious design decision. Not doing that (even for people that had turned on "notify on key changes"), would let whatsapp know which users could be securely MITM'd. Neither is a very good choice, but an understandable trade-off when it comes to security vs usability.

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