I don’t really like Apple, but once in a while they do the right thing. This comes from the App store’s new labels on apps.
Signal just has “Contact info” under the “Data NOT linked to you” category. This is just the phone number + contact discovery.
UPDATE
There’s another post adding telegram here. This is what it looks like:
Only the recipient actually thanks to sealed sender. So if you’re using a VPN, they can’t build your social graph. There are services that also allow you to create a one time phone number, which you can then secure with a removed so that you Signal identifier doesn’t get taken over by someone else. They are working on making it possible to use usernames instead of phone numbers.
And if you’re using Matrix or something like that, you are still trusting the admins of both instances (sender and receiver) with your metadata (and matrix leaks more metadata than Signal). If you’re running your own small instance, they can easily build your social graph just by monitoring the connection to that instance.
Signal also has a much more straightforward UX, making it usable for non tech-savvy people, which is often overlooked by free software advocates.
They have a ton of very good arguments here. You can also find Matrix’s response.
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