Well, yes. But when all your friends are already on Facebook Messenger, good luck getting them to install Signal only to talk with you. Network effects are important; a messaging app has no use when you have nobody to message on the app. Supporting SMS was taking advantage of its network effect, and I don’t think their network was big enough to be self-sustaining for most users (it wasn’t in my case, my only contact in there is my wife).
Well, yes. But when all your friends are already on Facebook Messenger, good luck getting them to install Signal only to talk with you. Network effects are important; a messaging app has no use when you have nobody to message on the app. Supporting SMS was taking advantage of its network effect, and I don’t think their network was big enough to be self-sustaining for most users (it wasn’t in my case, my only contact in there is my wife).
If a friend doesn’t care about you enough to perform the 1 minute task of installing signal they’re not worth your time