The long awaited game streaming app from Valve has finally been approved to the App Store. Apple initially rejected id over "business conflicts" over a year ago.
Steam link let's you play your PC games library on your phone. You can either use your Steam Controller paired to your PC or an MFi compatible controller paired to your phone. Yes you read right:
Steam link has full MFi controller support.
Valve updated the App so you can no longer buy games directly from iOS, but stream the games you already purchased.
Apples decision comes after the Supreme Court ruled that Apple has to face an antitrust lawsuit because of monopolistic nature of some practices regarding the app store (for example rejecting steam link in the first place, chrm chrm)