A long-simmering dispute between Google and Amazon has escalated into a front-burner feud, following Google's decision to block its YouTube video service from Amazon's Echo Show and Fire TV. Google apparently decided to cut off YouTube as retaliation for Amazon's refusal to carry its products, including Chromecast and Google Home. Further, Amazon has not made its Prime Video service available to Google Cast users. Amazon also recently stopped selling some smart home products from Nest, another subsidiary of Google parent Alphabet.