— "Continued growth, it turns out, was one of the main reasons Koum agreed to the Facebook acquisition. The deal allowed WhatsApp to concentrate on growth without worrying too much about revenue."
To me there's a giant difference between people focused on growth for the sake of growth and people trying to make a valuable product that is then rewarded with growth.
As an example, look at Google in the early days. They were mainly focused on making a great, valuable product. Growth was a consequence of that. In contrast, look at all the people that glued gamification, growth hacking, etc, onto mediocre mediocre products. As with things like MLMs, a growth-first focus can get business results, but I think it's a very different mindset than, "Let's make a product people love."
Growth is surely a useful metric for them, and from that quote, it looks like it's a goal. But a goal is different, broader thing than what one focuses on. Compare people who want to be, say, great athletes (and therefore famous) with people who just want to be famous. The former will focus on doing the hard work; the latter will be more inclined to chase self-promotion and attention directly.
I also RTFA, and it's hard to understand how someone could think user growth wasn't the focus.
— "…all of its attention has gone into making the app as simple as possible to get started with…" [Hint: They did this to improve virality.]
— "All along, he adds, the company's goal has been 'getting every single smartphone user on our network and getting them to use WhatsApp.'"
Plus, they'd said as much elsewhere as well. From https://www.wired.com/2016/01/whatsapp-is-nearing-a-billion-...:
— "Continued growth, it turns out, was one of the main reasons Koum agreed to the Facebook acquisition. The deal allowed WhatsApp to concentrate on growth without worrying too much about revenue."