If Amazon didn't care about owning app distribution, they would include the Android Market on their devices to make them more desirable to customers. They wouldn't have put the efforts in convincing me to put my apps in their store while imposing draconian terms (even worst than Apple!) where they control the prices developers' apps are sold. They wouldn't give away apps to get people to use their store.

Amazon goes as far as using writers to rewrite the descriptions of all apps before they are put up in their store. That is not the behavior of a company that doesn't care about app distribution.