This is terrible for the consumers but if I were Google I would have done the same. When Amazon pulled the Chromecast(and AppleTV) from their store a few years ago I suggested Google pull Amazon apps from Playstore. I guess this is the start of things.

I ended up with an Amazon prime membership but the only option I have to watch their content on my TV is by casting my chrometab, an inelegant solution because Amazon refuses to support chromecast.