https://thenextweb.com/apple/2018/05/25/apple-rejects-steam-link-app-on-ios/

Citing “business conflicts,” Apple has rejected Valve’s Steam Link app from the App Store.

What is it: Steam Link is an app that lets gamers stream PC games to their phones. It’s currently available (in beta) on Android. We originally reported that an iOS app was in the works – and it was – but now that’s not happening. According to reports, Apple blocked the app due to “business conflicts with app guidelines.”