Смотрите пункт 11.1:
Apps that unlock or enable additional features or functionality with mechanisms other than the App Store will be rejected
11.2:
Apps utilizing a system other than the In-App Purchase API (IAP) to purchase content, functionality, or services in an App will be rejected
11.12:
Apps offering subscriptions must do so using IAP, Apple will share the same 70/30 revenue split with developers for these purchases, as set forth in the Program License Agreement
И даже не стоит упоминать тот факт, что подписку можно купить через сайт - см. 11.13:
Apps that link to external mechanisms for purchases or subscriptions to be used in the App, such as a "buy" button that goes to a web site to purchase a digital book, will be rejected
IMHO не пропустят через модерацию.
