As the European Union is getting closer to implementing its General Data Protection Regulation, Apple has been clamping down on how location data is being used in apps found on the App Store.
Over the past several days, a number of apps that share location data with third-parties have been removed. Upon removal, Apple has notified developers of their violations of two different sections of the App Store Review Guidelines.
Section 5.1.1 and 5.1.2 of the guidelines prohibit developers from trying to identify anonymous users from aggregate data and disallows sharing personal data without obtaining explicit consent. All collected data may only be used for “improving the user experience or software/hardware performance” related to app functions or for purposes of advertising.