Why? People are free to download hundreds of apps to talk to each other. The Signal protocol is so widely adopted. Matrix is a well designed protocol. Why should Apple and Google be the ones dictating messaging protocols.
People aren't going to download some random app just to talk to you, nor will you be able to convince your whole family (who all use FaceTime/iMessage) to use something else just to include you.
Why? People are free to download hundreds of apps to talk to each other. The Signal protocol is so widely adopted. Matrix is a well designed protocol. Why should Apple and Google be the ones dictating messaging protocols.
People aren't going to download some random app just to talk to you, nor will you be able to convince your whole family (who all use FaceTime/iMessage) to use something else just to include you.