It can only be defined as a Google win if you choose just the right timeframe to look at. If you look at only the timeframe you have chosen, after Apple dropped Google, then yes, Google has a win. It is impressive for any app to get 10 million downloads in 48 hours. But include instead a year before Apple dropped Google, Google had their maps installed on 100% of iPhones! Apple played hardball and replaced Google (drops google to 0% of iPhones). Now Google has released an app with everything that Apple wanted in the first place and the result is that it is installed on 10% of iPhones.
End result:
Apple
-Has their own maps app that they can control and update as they see fit.
-Has a world-class Google maps app available for iOS users
Google
-Has 90% smaller market share on iOS (yes, I know that this will increase. But it will never again be 100%)
-Has to compete with Apple, and every other app maker, for users
iOS Users
-Have a choice about which map app to use
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To me it is pretty clear that Apple and their users won this battle.