WhatsApp is just distinct from Signal. They license our technology because our technology is the best, but they only encrypt the contents of messages using our encryption. They collect a huge amount of intimate metadata: your contact list, profile photo, who you’re talking to. Say you were my oncologist — they would have a record of the fact that you and I began talking at a certain point, the frequency of our conversations, who else we might be talking to.
Encryption is only one (but important) piece of the privacy puzzle.
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