I can't imagine Apple suddenly decided to ban AdMob from iOS apps without warning anyone. We were recently found to be the most popular SDK on their platform (
http://techcrunch.com/2014/11/19/apptopias-new-service-is-a-builtwith-for-apps/), so there would be a lot of angry developers if they tried to do something like that.
This forum is just for technical questions about the AdMob SDK, so I really can't comment intelligently on Apple's policies. I can say that there are thousands of apps in the App Store right now that use our SDK, though.
-Andrew