Is Amazon an open market? I can't buy Google Home products on Amazon so it appears that it's not an open market. If not an open market, then isn't it the same as a dealership promoting their own brand of cars first?
Yes you can
https://www.amazon.com/s?k=google+home&rh=p_89%3AGoogle&dc&q...
https://smile.amazon.com/stores/Google+Inc./page/080B7645-82...