OK? And for Apple, iOS is a means to end: to get people using their services and get their money alongside getting their money upfront. It just so happens that delivering quality experiences are a good way of achieving both Google and Apple's ends. People who hate their phones don't see as many ads as people who enjoy their phones.
The gap may not be as wide anymore, but I wouldn't be surprised if it still holds true. Pretty much every traffic stat report I've seen shows iOS users still account for about 75% of all mobile traffic.
But, of course, we are feeding the troll.