WA solves a problem that doesn't exist if all your contacts use an iphone. And it hadn't exactly "not penetrated" NA, there are probably tens of millions of us

WA solves a problem that doesn't exist if all your contacts use an iphone. And it hadn't exactly "not penetrated" NA, there are probably tens of millions of users. But it's definitely not "the default mode of communication" as in Brazil or India (+ lots of other countries).