As I predicted a while back
The Apple tactic was to get enough content providers onto there itunes platform with an "app" and then force them to use iTunes to sell the content the app views.
The content is still coming from the infrastructure of the publishers, they still need to host it and maintain it so the 30% is an additional levy.
To all the fanbois telling the world you cant build a distro channel for 30%, what distro channel do you think the publishers currently use? Do you think the subscription content already out there eminates from the arse of a magic elephant? Of course it doesnt, they already have both subscription and distribution channels!
Apple has used those early app providers to sell devices, now it has them it wants to force a new distro channel for content on them, the publishers dont need an in app sub service, they have a perfectly good one already.
What Apple have missed is that the App aspect of subscriber viewing isnt that large, all the content providers have to do is make it a sign in web page viewable on Safari, job done with no jobsian tax.
Ultimately this puts app creators out of business but Apple arent averse to a little collateral damage, they will just pop some iNets around the developers buildings to catch them when they jump!