[acoard]

I'd wager that's untrue. Anyone who buys an app, or in app purchase, is directly a Google customer.

I'd also argue that even if someone uses Play Store services, but doesn't pay a penny, they're still a "customer" in a looser sense of the word. They're engaging in the market-place, likely using free apps subsidized by advertising. Even if you want to argue that they're the product instead of the client (and I'd be inclined to agree), they're still revenue-generating users.