When you say "greedy US corporations" do you mean that these US corporations are uniquely greedy, or that all corporations are greedy, and this is bad for the ones in the US? Do you think that corporations in China, which in many cases are subsidized by the government, are also greedy?
all for profit companies are greedy by their nature, but US companies are on a different level because you can 'buy' the government by lobbying or supporting their election campaigns or break the law and eventually make sure law is changed to fit your business (e.g. first taxi medallions adjusted the law for themselves, and then Uber)
Same is very difficult to do in China (look what happened to Jack Ma) or in Europe, because you have to follow some regulations