This is not a useful distinction. The API existed and was used by Apple apps and by jailbreak apps. In fact Scott Forstall intentionally prepared iOS to have third-party apps. The API was just not public yet.
If you think the header files are the thing that Apple thinks is worth of a cut of app revenue, I think you're way off base. It's the technology, whether you access it with permission or not.
Right, and my point is that the technology is already fully paid for by the user. By "the SDK" I meant the dev environment stuff, not the API base on the phone.
The app revenue cut is because you partner with Apple to deliver a solution to something in a users life with them. Apple sees themselves as critical to an app’s ability to exist at all. Its like nintendo taking a cut of a nintendo game. You cant have one without the other. A lot of people disagree that the iphone is a one of a kind consumer product like this. To many its just a computer and software is independent. I see both sides