If Apple were to be required to allow third party App Stores or side loading apps, could it legally deny interoperability with Apple services as a “security measure,” like a sandbox? For example, you can download a game, but it won’t hook into their gaming social network. No ability to share in iMessage, or sync data to iCloud. Basically cripple the apps so that for the end user it isn’t worth saving the money on the apps that don’t have the 30% markup.