> admittedly Whatsapp app was generating revenue although I doubt it was much I imagine they made ~$100m last year (400m active users, I'm guessing 100m of whi

> admittedly Whatsapp app was generating revenue although I doubt it was much I imagine they made ~$100m last year (400m active users, I'm guessing 100m of which using for more than a year), which is almost guaranteed to go up. For a company with ~50 employees how is that not sustainable?