I'm surprised that so few other people on this comment thread seem to get it. Google Play and the associated Services ecosystem exists for the sole purpose of forbidding exactly what Amazon is trying to do. Amazon's sole purpose for this phone is as a way to get phone customers into their ecosystem first, and Google's stuff exists to get people on the Google ecosystem first. A first-party device with Google Play and Amazon services is Not. Gonna. Happen.
"Google Play and the associated Services ecosystem exists for the sole purpose of forbidding exactly what Amazon is trying to do"
Er... are you sure android apps for gmail, calendar, drive, youtube, maps etc. and not to mention, the play store for android exist for the sole purpose of blocking third parties? Surely they have their own utility to users... no?
I actually wouldn't be surprised if that were the case. They already don't allow third-party app stores (like Amazon's app store or F-Droid) on the Play Store last I checked; in both cases, you have to enable app installation from "untrusted sources" and download/install the APKs manually.