I've seen that revenue stat mentioned before, but never any evidence that this isn't due to something like Android having free options available for functionality that only paid apps have on iOS.

Name one bit of useful Android functionality that is only available paid on ios. There isn’t any. The average Android users pay far less for their phones, and spend far less on apps, that’s been true forever.

Apple targets only the top end of the market. I’m a mobile developer and that’s why native apps are almost always iOS first. We know our iOS sales will be higher, and these are proprietary apps, not system features.