By that definition, Microsoft also makes a ton from gaming on the PC, as both a publisher and distributor of games.

One could argue that a large percentage of premium desktops and laptops choose windows for gaming compatibility and attribute a part of Windows revenues to gaming too. But that would be gaming numbers!

I think it fair to compare app store gaming revenues to consoles, as NO ONE buys an iPhone for gaming. They happen to (casual) game on the device they have on them in bed, or on the train, or everywhere.