3.8 – Developers are responsible for assigning appropriate ratings to their Apps. Inappropriate ratings may be changed/deleted by Apple
The rating you’ve selected, 12+, is inconsistent with the content of your app. Since your app includes contests or sweepstakes, you must select “Yes” for Gambling and Contests in iTunes Connect.
Please update your Rating selections in iTunes Connect.
– Log in to iTunes Connect
– Click on “My Apps”
– Select your app
– Scroll down to select a Rating on the App Details page
– Click the Edit button next to “Rating”
– Change the Rating selections
– Click “Save”
– Once you’ve completed all changes, click the “Submit for Review” button at the top of the App Details page.
NOTE: Applications must be rated accordingly for the highest level of content that the user is able to access in the app.
簡單說就是 App 裡面的抽獎、贈獎活動包含了賭博的成分，必須在年齡分級裡勾選 “賭博和競賽” 。
另外可能也需要增加與 Apple 無關之聲明，請參考此文章。