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This is an absolute win-win for Microsoft and Amazon. Microsoft gets Android Apps, Amazon expands its app store and Google is shunted out of the Microsoft eco-system. I see this as an absolute brilliant thing to happen to the app ecosystem. I really hope innovation accelerates on the Amazon App store.
Plus it counters Apple, which recently made iOS apps available on macOS. Seems like all the major OS are betting that mobile is going to be the focus of future native app development and don't want desktop users to miss out.
No one can match the level of integration Apple had made on Windows and Android platform.
We'll see what kind of limitations and bugs to show up.