Over my head…
It sure seems like Google doesn't give much credence to this type of info. Just this week, Google says it might get around to purging the store of apps that violate their Terms Of Service (e.g., inappropriately taking customer data). Here they are, in a full-out race with iPhone, and they still have what is widely characterized as a store infested with spyware, apps that don't do what they say, inability to even buy an app in many countries, etc.
There COULD be method to Google's madness: they want to provide a wide-open access to the internet, and little else. They seem to care very little for the little games, expense trackers, etc that aren't all about the www.
But if this data even remotely suggests what people like to do with their mobiles, Google's approach is puzzling. Why not make it easier for developers to sell apps, and customers to toss a couple of dollars to the people who make these little charmers? Most of these apps are priced less than what you might tip your server at lunch, and they build customer loyalty.
Of course, there are many aspects to Google's tactics that are over my head. Anybody who wants to point out why apps hardly matter, please feel free.