Apple keeps changing things which means more work for iOS developers.
Recently I have started receiving a slew of notifications from Apple telling me that my apps do not follow the App Store Review Guidelines.
If you get one of these emails and don’t do anything about it within 30 days, then your app will be removed from the app store. More detail is provided in your developer account if you click on the Resolution Center hyperlink in the email.
Dear Developer,On September 1, 2016, we announced that we will be implementing an ongoing process of evaluating and removing apps that no longer function as intended, don’t follow current review guidelines, or are outdated.We noticed that your app has not been updated in a significant amount of time.Next StepsTo keep your app on the App Store, submit an updated version for review and make sure it follows the latest App Review Guidelines. If you are unable to submit an update within 30 days, your app will be removed from the App Store until you submit an update, and it is approved.If Your App is RemovedYour app will remain fully functional for current users. They will experience no interruption to services, will still be able to buy in-app purchases, and can re-download the app while restoring from an iCloud or iTunes backup. However, we recommend that you update your app as soon as possible to reinstate it on the App Store and ensure that it remains functional and engaging for new and existing customers.You can continue to use your current app name, as your app has not been deleted from your account. However, please note that if your app name is longer than 50 characters, you will need to modify it to meet current naming guidelines.Additional InformationLearn more about changes to the App Store and keeping your apps up-to-date.
App Store Improvements
App Review Resources
Debugging Your AppsBest regards,App Store Review