It's very hard for security conscious people to attract other people to more privacy conscious platforms. People love the practicality, and don't want to trade for they can't see or understand.

I'd love to use signal, but it'd be a very silent place, and have to have WhatsApp anyway. So, instead of trying to entice others, I just try to win a one small battle at a time, reducing my cross-section step by step, where I can.