It will be interesting to see how this plays out. Apple is (indirectly) going after any ad that they themselves don't power with iAd. Is that even considered "fair", in a legal sense? Seems pretty anti-competitive.
http://www.theverge.com/2013/7/10/4510338/apple-found-guilty...
http://www.cnet.com/news/judge-rejects-324-5m-wage-fixing-se...