The company in question, Youmi, is a Chinese-based advertising company. The list of the questionable apps is not yet made public.
It was revealed that it goes against the policy as Youmi collects email addresses, collects information about installed apps, series and even more. This is a serious compromise as it’s found to have one million estimated users of these apps. The data is sent in a way that it’s only sent to the creator of the app by using software dev kit which delivers ads.
After this finding was revealed, Apple released the following press statement:
“We’ve identified a group of apps that are using a third-party advertising SDK, developed by Youmi, a mobile advertising provider, that uses private APIs to gather private information, such as user email addresses and device identifiers, and route data to its company server. This is a violation of our security and privacy guidelines. The apps using Youmi’s SDK will be removed from the App Store and any new apps submitted to the App Store using this SDK will be rejected. We are working closely with developers to help them get updated versions of their apps that are safe for customers and in compliance with our guidelines back in the App Store quickly.”