While Android is a smartphone OS, it is questionable whether android devices are being used as smartphones by majority of the users who have android devices.
Most of those phones are at the extreme low end and aren't used as smartphones the way iPhones are
And yet the Play Store generates way less money than the App Store. It's ridiculous how lopsided the difference is actually. I mean, does that 15% really have more spendable money than the other 85%? Something else has to account for these results.
Android is more popular in emerging markets. In most of these markets cash or mobile money payments are common. Most banks locally charge a monthly fee to have your card enabled to do online payments which is a pain in itself. Oflate things have started to change as most retail giants have started offering branded prepaid cards for both online payments and loyalty points.