Facebook is an entirely different kind of business than Walmart or Amazon. Facebook (and social media in general) is essentially a public forum and comes with

Facebook is an entirely different kind of business than Walmart or Amazon. Facebook (and social media in general) is essentially a public forum and comes with the expectations of such since these companies control such a large part of internet discourse. If all of them said "we won't allow anyone to talk about any of our competitors on our site" then it strikes me as a company using their dominance to silence other players in the market, i.e. anti competitive behavior.