Let this be a lesson for other messaging applications: giving users an ultimatum where they have to give up their privacy in order to continue using a product i

Let this be a lesson for other messaging applications: giving users an ultimatum where they have to give up their privacy in order to continue using a product is a bad idea. Damage is done for users -- who have already accepted to give their contact lists and whatnot -- and for WhatsApp although at a much lesser degree. Network effects and migration costs will retain their users, but for how long?