It's too bad Spotify rather than Epic wasn't the plaintiff in the major antitrust litigation happening now, as Spotify is drawing much cleaner lines that also recognize the value of the single App Store approach. Even if one believes consumers benefit from Apple's single App Store and that Apple should be able to charge fees to achieve the necessary curation and security benefits it provides (which I do), there's still no reason Apple should be allowed to block developers from instituting their own payment systems.