I don't keep super close track, so maybe Apple's commanding profit share lead is eroding sharply. Last I checked, "commanding" was indeed the word for it.
Again, all I'm saying is that you can spend a lot of money for a huge footprint in the market and still find yourself at the bottom of the value chain: you can be the guys facilitating a lot of commerce for other people without taking a significant cut.
If you don't believe Google cares about that, why are they wasting their time with G+? Facebook isn't going to be a search engine. Nobody believes that. The worry is that Facebook is going to commoditize search by moving the profits it generates somewhere else.