I'd like to see someone with more legal knowhow chip in but I'm fairly sure the fact that the app store does restrict apps to be the most compelling legal case

I'd like to see someone with more legal knowhow chip in but I'm fairly sure the fact that the app store does restrict apps to be the most compelling legal case for its existence? If it literally blocked nothing then Apple can't say that the app store is part of the ecosystem that makes it unique. If it has a high bar for restrictions, it can successfully argue to avoid spamware and other bad quality apps Apple is going the work for the user to make the phone experience worthwhile.