If you look at most (all?) of the android based tablets out there- and there are a LOT of them- you don't see usually see any mention of the source of apps for it. That's because most (all?) don't have access to the Google Marketplace and having access to the Amazon App store is not yet a selling feature.
It's a safe bet that if Amazon comes out with a 7" Android based tablet that it, too, will not have access to the Google Marketplace. It will be limited to the stuff available on the Amazon Android App store, if for no other reason than they want to drive more people to their app store.
An Android based tablet from Amazon would be just one more in a field of a hundred that accesses the Amazon app store, not the Google Marketplace. If Amazon wanted to really do killer business with such a tablet they'd need to grow their app store so that it becomes a positive selling factor and/or get the Google apps into their app store.
The Google apps (Google Maps, Google+, etc)are generally the best stuff in the Google Marketplace, surrounded by a lot of fluff and outright garbage. Right now the Amazon app store looks mostly like all the fluff and outright garbage from the Google Marketplace.
I don't know why Google restricts access to its Marketplace. One would think that they'd try to give every Android device access, but clearly that is not the case. Maybe it's a matter of the different versions of Android that run on the various hardware platforms, which also explains why there are so many devices running older versions of Android. I suspect that a lot of the apps in the Google Marketplace will only run properly on the officially sanctioned versions of Android (which in-turn only runs on officially sanctioned hardware platforms) and Google may be trying to protect its name by not allowing devices that will have compatibility issues with apps from accessing those apps.
It will be interesting to see how all this shakes out.
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