Any in-game purchases for streamed games are done through Steam, thus circumventing Apple's monopoly on complete and total control over its App Store revenue. And it's not just small developers this affects as Valve just got the same treatment for its Steam Link app.
Valve has since released a statement where the Half-Life developer said that Apple approved Steam Link for release on May 7, but in the end rejected the app because there were conflicts that the iPhone maker didn't see in their first review of Steam Link.
"The team here spent many hours on this project and the approval process, so we're clearly disappointed". Steam Link was supposed to be available for that platform, but Apple is said to have revoked its approval of the app shortly after Valve revealed it.
The details behind these business conflicts with app guidelines are now unclear since the app is quite similar in core functionality to other apps available on the App Store. Not only do you need a decent network for Steam Link to work well, it also won't function outside your home - where many people take their phones.
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It's entirely possible, then, that Steam Link was blocked because it would have allowed gamers to make purchases through Steam from inside PC games.
At the moment, it's not clear what Apple's "business conflicts" are, though we have contacted Apple for comment and will update this piece if and when we hear back. For the time being, Android users can pick up the Steam Link beta on the Google Play Store.
The physical Steam Link box, which wirelessly pipes PC games to a TV.
Valve designed the app to work with both, and it's already been released on Android, but it seems Apple has other ideas.
KitGuru Says: This is an unfortunate turn of events for many iOS users like myself.