Perhaps most of interest though would be how many phones are owned otherwise, to give access to the protester Signal comms anyway
And also metadata must still fly around anyway, no?
Often this answer is accompanied by pure sarcasm where if you are concerned about this feature, you are told that Signal is not for you and "you can go play at being a spy and sharing a secret decoder ring with your friends", as these people regard PGP to be. I wish those Signal advocates could lay off the sarcasm, it just makes the project look bad.