Aren't they both anti-trust problems? Suppose Apple bans apps that compete with some service they offer themselves. Allowing them to be banned in alternate stores as long as Apple also bans them in their own store is clearly not going to make that better, right?
> compete with some service they offer themselves
if you move from ban to, systematically hinder updates, despotic interpretation of store TOS/Guidelines/Rules, APIs their apps can use and others can't which affect competitiveness of the apps, not having to pay their own fees, randomly removing top apps from the app store front/ranking/promotion, TOS which make competing impossible etc.
then they have been doing exactly that for years
i.e. "not ban but market wise not that different"