Sorry, but the original commenter is correct. They received relatively small amounts of seed funding in 2009 and later charged a nominal amount to cover text verification, but they still were a classic VC-funded play: receive tens of millions in VC dollars to operate at a loss for years to build market dominance. From the Wikipedia page:
> In April 2011, Sequoia Capital invested about $8 million for more than 15% of the company, after months of negotiation by Sequoia partner Jim Goetz.[63][64][65]
> By February 2013, WhatsApp had about 200 million active users and 50 staff members. Sequoia invested another $50 million, and WhatsApp was valued at $1.5 billion.[26] Some time in 2013[66] WhatsApp acquired Santa Clara–based startup SkyMobius, the developers of Vtok,[67] a video and voice calling app.[68]
> In a December 2013 blog post, WhatsApp claimed that 400 million active users used the service each month.[69] The year 2013 ended with $148 million in expenses, of which $138 million in losses.
I mean, when Facebook bought WhatsApp for billions, what did people expect? How else were they going to monetize?