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From what I understood, the app has a button to activate a feature, and the user doesn't know that the feature isn't free until he presses the button. Apple hasn't liked that in other apps. Anyway, it ticks people off.I think there are plenty of apps operating the same way. You basically have a fully operational free version plus certain features unlocked with in-app. At least I had about 10 updates approved. I am not aware of any App Store rules prohibiting that.