I don't remember paying even the $1 to them ever and I've been using WhatsApp for a good few years. Every time the expiration date approaches, it automatically

I don't remember paying even the $1 to them ever and I've been using WhatsApp for a good few years. Every time the expiration date approaches, it automatically gets pushed away. Either they were just giving away subscriptions intentionally or I'm just one lucky bastard. So, No, they never had 1 billion dollar paying customers.