this post was submitted on 14 Oct 2025
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not op but signal has basically solved this. users are not just randomly accessible by anyone. they can share a long URL that contains an ID, or make a short username they like and pass around to people. and even then the recipient has to accept being contacted by each other user
true that signal now relies on the phone number system for trust and safety, but that's not core to how signal works, it could be replaced if they really wanted.
At that point, you (well, not you per se) are basically suggesting to replace the telephone system with a Signal-esque system. Which would break a billion things in real life, for little to no gain.
any change would break a billion things in real life, so we could at least have a proper replacement.
the problem with signal here is that it's centralized, probably couldn't even handle the load besides other problems. but that's solvable, like look at simplex which is similar