> Interestingly, Google has all its products out for the desktop version on Windows 8.
Comparing Windows 8.x's desktop marketshare with Windows Phone's mobile marketshare might give a clue as to the reason why Google has apps for the former but not the latter.
Yes, the same reason why Google can't avoid making its apps for iOS: "Monopoly". Windows holds a monopoly in the desktop and there is no way Google can't ignore that. Now with the announcement of "Universal apps" by MS, where you write for one windows device and easily port it over for the rest, wonder if things will change.
Comparing Windows 8.x's desktop marketshare with Windows Phone's mobile marketshare might give a clue as to the reason why Google has apps for the former but not the latter.