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Last i checked, Signal requires a phone number. That means all users are dox'd - lots of meta-data to analyze.
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Except there is no metadata to analyze. That is the point. They are very open about the fact that the only data they have is when your account was created and (i think) your last login time.
The phone number was a stroke of genius because your phone contacts is your social network. Really easy bootstrapping off the existing network.
There are other options that don’t require a phone number, but predictably they are less popular. Try Session, Status, Matrix, XMPP, etc.
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He is already doing that, though. Signal has been pushing the whole space forward for years now. Just by existing, they are a critique of messengers like Telegram. But people often don't realize the truth about Signal's competitors, so he's just laying it out there.
What kind of innovation or improvement do you think Signal lacks?