Re: Games potential?
There are many devices that work with iOS and have a free app, but these apps communicate over an unrestricted channel like WiFi or Bluetooth.
There are also a few games that rely on physical objects and use the iPhone or iPad as a remote (Sphero and Anki Drive come to mind), but again, these apps don't have a hardware interface component.
Osmo is noteworthy because it uses a custom hardware interface -- something Apple tries to limit through its MiFi program -- and weds it to a game (and not a remote control interface like Sphero or Anki Drive).
It is noteworthy particularly in the context of games, which have come under so much pressure to be free and present such a profit challenge to game developers. The existing business models for game apps -- paid, ads, and in-app purchases -- all are problematic and few game companies but the largest can manage this challenge. GE doesn't face this issue with a $500,000 medical scanner.
And Apple's 30% fee for iOS apps qualifies as a tax more than Google's 30% fee because it's mandatory if you want to sell iOS apps (or in-app items). Google's fee is optional, just as Apple's Mac App Store fee is for OS X apps. If you don't want to sell through Google Play, you can distribute your .apk file through other stores (which may not offer a better deal) or via your own website. There is no legal way to sell iOS apps without that fee, just as there's no legal way to sell taxable goods and not pay tax.
As for the Google tax, that's a different article, related to advertising and websites.