https://www.reuters.com/article/us-eu-apple-facebook-microsoft/facebook-microsoft-gripes-with-apples-app-store-on-eus-antitrust-radar-idUSKCN256233 >Facebook and Microsoft's grievances over how their gaming apps appear on Apple's App Store may feed into an EU investigation into the iPhone maker's business as EU antitrust regulators said such concerns are on their radar.