The key point in the Kodak case was that Kodak changed their policy on selling repair parts after people bought the original product, and the change in policy is what led the Supreme Court to decide that the market for repair parts was a separate and relevant aftermarket, because the people that bought Kodak copiers lacked information at the time of purchase about Kodak's repair policy and therefore were locked-in to buying repair services from Kodak after the fact.

Subsequent cases since Kodak have continually narrowed the scope in which Kodak is applied, and it likely would not apply here because people who buy iPhones have known since the App Store launched in 2008 that the App Store is the only place they'll be able to install apps from.