https://www.cnbc.com/2019/03/13/apple-music-for-amazon-fire-tv.html

Apple Music launched on Amazon Fire TVs in the United States on Wednesday. It is the latest sign of Apple's continued push to get its services, including Apple Music, in front of as many people as possible. Apple Music launched on Amazon's Echo smart speakers late last year.

This change of pace from Apple's standard walled-garden approach to services was most prevalent at CES 2019 where Apple said that iTunes will soon be available on Samsung smart TVs. Eventually dubbed a bug, Apple Music also appeared briefly on Google Home units but was never active before it was pulled offline.