WA is not ubiquitous in some big parts of the world. It's not like it is ubiquitous in "the rest of the world". In China at least WeChat takes the crown and I don't know about other Asian countries.

Lets not make WA seem more "unavoidable" or seem more ubiquitous than it really is. It's got sufficient network effect already.

In south east Asia it's mostly Line and WeChat.