Cloud gaming is the next step in mobile gaming, with services like Microsoft project xCloud aiming to bring AAA titles right to your mobile phone. Microsoft has already been testing its xCloud application on Android and iOS devices for some time, and the application was supposed to launch sometime in September. However, it seems like Microsoft is only going to serve the customers on Android, as Apple says that these types of applications violate App Store guidelines. This doesn't only apply to xCloud, but also Google's Stadia gaming platform. When developer uploads application to App Store for iOS, the application goes through a review by Apple, for security reason and for Apple to check if it meets its guidelines.

Being that xCloud and Stadia are types of applications which offer a way to access many more applications (games in this case), this is against Apple's policy as they can't control the applications these services offer.Here is the official statement from Apple regarding the situation:

AppleThe App Store was created to be a safe and trusted place for customers to discover and download apps, and a great business opportunity for all developers. Before they go on our store, all apps are reviewed against the same set of guidelines that are intended to protect customers and provide a fair and level playing field to developers.

Our customers enjoy great apps and games from millions of developers, and gaming services can absolutely launch on the App Store as long as they follow the same set of guidelines applicable to all developers, including submitting games individually for review, and appearing in charts and search. In addition to the App Store, developers can choose to reach all iPhone and iPad users over the web through Safari and other browsers on the App Store.

Microsoft's response follows:

MicrosoftOur testing period for the Project xCloud preview app for iOS has expired. Unfortunately, we do not have a path to bring our vision of cloud gaming with Xbox Game Pass Ultimate to gamers on iOS via the Apple App Store. Apple stands alone as the only general purpose platform to deny consumers from cloud gaming and game subscription services like Xbox Game Pass. And it consistently treats gaming apps differently, applying more lenient rules to non-gaming apps even when they include interactive content. All games available in the Xbox Game Pass catalog are rated for content by independent industry ratings bodies such as the ESRB and regional equivalents. We are committed to finding a path to bring cloud gaming with Xbox Game Pass Ultimate to the iOS platform. We believe that the customer should be at the heart of the gaming experience and gamers tell us they want to play, connect and share anywhere, no matter where they are. We agree.

You can draw your own conclusions from here.