Google says that Amazon is not selling Google products, and due to the lack of reciprocity, they are no longer supporting Youtube on Amazon.
Statement from Google
“We’ve been trying to reach agreement with Amazon to give consumers access to each other’s products and services. But Amazon doesn’t carry Google products like Chromecast and Google Home, doesn’t make Prime Video available for Google Cast users, and last month stopped selling some of Nest’s latest products. Given this lack of reciprocity, we are no longer supporting YouTube on Echo Show and FireTV. We hope we can reach an agreement to resolve these issues soon.”
Amazon and Apple go together, or kind of
Since this month, Amazon Prime is available on Apple TV again, and Amazon USA is selling Apple TVs also again. But not in all countries. In Germany, one of the first results, when users search for “Apple TV” on Amazon, is still a Fire TV Stick. Same is happening when US users search for “Chromecast” in the US, as Amazon is still not selling Chromecasts from Google.