On John Battelle's Searchblog today:
As All Things Digital notes today, Apple this week "clarified" its policy with regard to third party networks, and it's hard to read it as anything other than a direct declaration of war with Google. In short, third party ad networks can run in AppWorld, but only if they are "independent". Put another way, sorry AdMob, you're not welcome here. (I interviewed AdMob CEO at the CM Summit Monday, and asked him about this. This was before the policy was clarified, but he seemed pretty certain Apple would do this.)
I think this is shortsighted and wrong. I also think it's classic Apple. It's a re run of the Us vs. The World mentality that forced the Mac into a corner back in the late 1980s. This time, Google plays the role of Microsoft, but it really doesn't matter. Apple won't let anyone play in their iWorld who might pose a competitive threat.
This is all we need now - a major platform war, with marketers and developers having to pick sides, cost of development, ad serving, analytics, and marketing services at least tripled (one process for Android, one for iPhone/Pad/Touch, one for Microsoft or Palm/HP or.... ). That's not what the web is about. It's disheartening."