As per http://variety.com/2017/digital/news/google-blocks-youtube-fire-tv-echo-show-1202631248/ http://variety.com/2017/digital/news/google-blocks-youtube-f...

As per http://variety.com/2017/digital/news/google-blocks-youtube-fire-tv-echo-show-1202631248/ http://variety.com/2017/digital/news/google-blocks-youtube-f... "However, a source familiar with YouTube’s thinking told Variety Tuesday that this newer implementation also violated YouTube’s terms of service by layering voice control onto a web app that wasn’t designed for voice interaction."