I'm still unclear on what part of the App Store makes it impossible for companies to engage with their customers. I've played many Bungie games, but nowhere in

I'm still unclear on what part of the App Store makes it impossible for companies to engage with their customers. I've played many Bungie games, but nowhere in the purchase process for any of their games was I encouraged to form a relationship with the company. Any back-and-forth with companies happens in channels other than the retail channel; twitter, forums, websites, etc. I don't understand why selling on the App Store vs, say, PSN Store, or Xbox Live Arcade, or any of the numerous Windows PC retail channels, affects the ability to engage with customers in this fashion.