Apple TV app launches on Amazon Fire TV devices [update]

Update: The Apple TV app is now also available on the Amazon Fire TV Cube.
Apple today released the Apple TV app for Amazon TV devices, starting with the Amazon Fire TV Stick 4K and the older HD model. Support for Fire TV (3rd generation penchant design) and some other models is coming soon.
The TV app experience on Amazon’s platform mirrors the functionality of the Roku app, which launched last week. Users can watch their purchased iTunes movies and TV shows, access Apple TV Ch