True but this take is a bit naive. I used to live in Brazil, where Whatsapp is the defacto communication method, for example. You might stand on principle all you want, but if you don't have that as a primary communication channel for a service/end-user oriented business -- even if you have all the alternatives imaginable!!! -- you are going to have a RIDICOUSLY hard time. Just on my personal life with folks there, if I were to just not participate in Whatsapp it is not an understatement that the social fabric of my life would significantly change. For the worse.