If I'm not mistaken, it was Google who started blocking Amazon's Echo from serving YouTube content on devices with screens, so this type of anti end user behavior isn't exclusive to Amazon.
I don't pretend to know what that broken user experience was.. ads blocked? No auto play next? No subscriber button? But anything along those lines would be a poor deal for YouTube. Im not a fan of either as they both engage in illegal anti-competitive behavior I just feel it isn't one sided in this case.