You're assuming you know why the app was pulled. Was it pulled because Apple's going to introduce a competing feature in iOS 6 and doesn't want the competition? Or was it pulled because the app is using the leaked AirPlay encryption key? Or was it pulled for some other unknown reason?
We don't know.
Frankly, I doubt Apple would give a damn about competition for a feature they plan to introduce in iOS 6. They don't care about other apps that reimplement iOS features, such as music players or (now) mail clients. Why give a damn about AirFoil?
Finally, unless you own, or no one owns, the platform on which you're developing, you're always at risk for something like this happening. This is nothing new, and it's definitely not behavior that's isolated to Apple.
We don't know.
Frankly, I doubt Apple would give a damn about competition for a feature they plan to introduce in iOS 6. They don't care about other apps that reimplement iOS features, such as music players or (now) mail clients. Why give a damn about AirFoil?
Finally, unless you own, or no one owns, the platform on which you're developing, you're always at risk for something like this happening. This is nothing new, and it's definitely not behavior that's isolated to Apple.