I think you are making the assumption people cannot use two apps. I don’t know a single person using Sognal that doesn’t also use WhatsApp. If they use signal,

I think you are making the assumption people cannot use two apps. I don’t know a single person using Sognal that doesn’t also use WhatsApp. If they use signal, I will communicate with them on signal. That’s how the situation evolve. Install signal, have people contacting you on signal.