It is on every persons phone, it is the defacto standard. There was a big push about two years back by many people to change application when Whatsapp's privacy

It is on every persons phone, it is the defacto standard. There was a big push about two years back by many people to change application when Whatsapp's privacy policy was changing and many pushed telegram and signal. The two or three of my friends, who left and held out, have now reinstalled Whatsapp. There's simply no easy way for them to speak to everyone else. People are reluctant to text and won't bother installing another application. (BTW this was in Africa.)