$400 million USD total revenue in 2016 (from the article) is not exactly "billions of dollars". But, in general, yes, I think the sales force required to engag

$400 million USD total revenue in 2016 (from the article) is not exactly "billions of dollars". But, in general, yes, I think the sales force required to engage advertisers should not be discounted when the first thing going through the head is "but it's just an app!".