I think they care a little. Apple continues to make interesting moves that hint at moving away from using Google's service stack. They've acquired some companie

I think they care a little. Apple continues to make interesting moves that hint at moving away from using Google's service stack. They've acquired some companies that specialize in services that Google currently provides, for example. Plus, Bing is now an option for Mobile Safari's search bar. Android is a direct win for Google because they're guaranteed some influence, which means more opportunities to serve the latest hot ad unit. Anything that isn't Android is a much more tenuous proposition. Look at iAds.