You're only counting one revenue stream on one app from Pixelmags. It appears they have 12 apps on the market including readr. You counted 10k magazines but what about the user subscription revenue a 9.99. They also have some games they're recently released or updated that are not free. Here are three new apps from Pixelmags

https://itunes.apple.com/us/app/2017-pro-circ...84451?mt=8
https://itunes.apple.com/us/app/habitus-magaz...76631?mt=8
https://itunes.apple.com/us/app/msi-natural-s...91477?mt=8

I'd say we've passed 21M in revenue.