I just don't get it. What is so difficult about providing a one-time authentication through the user's phone? Just open Whatsapp on the smartphone, get a token, put your phone number and token and voilà! I mean, there have been web chats for decades now, so I don't understand why they invented such a messed up set of constraints. Besides, am I the only one who suspects that Whatsapp is boycotting Apple? They needed a…
I understand the theory but all this does is hurt them. They need as many people as possible using there app for it be useful. They're also owned by Facebook who update all their apps weekly.