>Most of the examples of Google closed apps that are not part of the AOSP release are in fact apps that are based off of Google data-center services. Would it really help Samsung if the source to the Gmail app was open? Since Google controls the server side, and the client-server protocol, it limits the amount of innovation they can do.
I don't think Google's development of their own services is issue here. The issue, in my understanding, is that Google ties its services to Android under "Android compatibility" label.
Skyhook is a great example (the article mentions it) - mapping is important for Google, and Google literally pushed the company out of business by strong-arming manufacturers to stop using Skyhook services.
Can, say, Samsung make a deal with Yahoo to drop gmail, include only Yahoo mail on their phones and still pass "compatibility" test in Google, and have access to Google Play store and the rest of the services? Can you imagine HTC phone with Nokia maps? (speaking of maps and Nokia, anyone is quick to point that Nokia made a huge mistake not betting on Android as Symbian replacement. And couple of months ago we saw that mapping is so important to Nokia that they're ready to let negotiations with Microsoft fail just to keep mapping in their hands. Does anyone thinks that Nokia would be permitted to make Android phones with Nokia maps?)
The fact that Google services are (mostly) better than competition isn't relevant here - back in the day Internet Explorer was way better than Netscape Navigator, but that fact didn't made MS actions any better.