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.
Well I don’t get spam from signal. However if you want anonymity find something else. Or don’t talk to anyone. Most of our cellphones leak all kinds of data you won’t get privacy in most phones and you shouldn’t expect it either.