Apple has decided to reject Valve's most recent app from being listed on the iOS App Store.
The recently announced Steam Link app initially slated for release on both Android and iOS enables users to stream gameplay from their more powerful desktop and laptop computers and enabled them to be played using their smartphone or tablet screens as displays over a local area network.
In a mass email response first reported by user Beefmagigins on Reddit's r/apple subreddit, Phil Schiller, Apple's senior vice president of Worldwide Marketing, stated the following:
We care deeply about bringing great games to all of our users on the App Store. We would love for Valve’s games and services to be on iOS and Apple TV.
Unfortunately, the review team found that Valve’s Steam iOS app, as currently submitted, violates a number of guidelines around user generated content, in-app purchases, content codes, etc. We’ve discussed these issues with Valve and will continue to work with them to help bring the Steam experience to iOS and Apple TV in a way that complies with the store’s guidelines.
We put great effort into creating an App Store that provides the very best experience for everyone. We have clear guidelines that all developers must follow in order to ensure the App Store is a safe place for all users and a fair opportunity for all developers.
Neither Apple nor Valve have shared any additional comments on the matter. In the meantime, a Change.org petition to release the Steam Link app on the App Store has reached over 700 signatures as of this writing.