As a PostScript developer you were welcome to work with Adobe's low-quality font technology, but Adobe refused to allow any developer to access its proprietary high-quality APIs.
Sounds like something Apple would do, doesn't it?
There are a lot of things I, as a developer, don't like in Apple decisions on iPhone development and App Store policies, but to my record I've never seen such a behavior from Apple.
Apple does not deny developers to use high quality technologies for its platforms, apart of the private API, but that's another matter.
So I might miss something, but in my opinion, if you work on an Apple platform you get from Apple all the technologies to work on it.