signal requires a phone number to sign up. a phone number could be used to trace your signal account back to you. so why do people, especially privacy enthusiasts and experts (like edward snowden), still use it and endorse it when it lacks anonymity in that sense? i get that people could use a voip number or something to sign up, but still.
Signal is great for private communication with people you already know and trust. I was in a situation where I was organizing with new friends, and we had a big group chat on Signal. I cloned Signal to a work profile, and registered it with a cheap VOIP number, so that I could keep my real phone number separate from my political organizing activities.