Signal may not be the best in a technical sense, but it is good enough and it has the network effect. I’ve been pleasantly surprised when in the span of a few months I met two different people actually in real life, who happened to already be using Signal.

Signal is also just as usable as the big tech alternatives, which makes it not a very hard sell to friends and family. For quite a few years now I have managed to convince everyone I communicate with to do so over Signal. There is no chance I would be as successful with something else.