All of which is somewhat besides the point and off topic from this particular issue: When Amazon Video started out, it was not an open forum-- it was not YouTube. Part of its appeal was that it was a somewhat curated selection of content. Watering that down with content that takes more time & mental effort to sift through the crap isn't really a great experience or what drew people to the platform. Believing Amazon shouldn't do that is hardly a blow against free speech or something.
I also fail to see how curated content somehow goes against the values of the constitution. Every news paper, book publisher, TV channel or other media outlet, ever, has exerted editorial discretion over the content they choose to make available. Believing that model to be superior to a "fire hose" approach is not inherently anti-constitutional.