The author is nitpicking. Warren may be wrong about the history of bing and google, but that's not really important. She's 100% right about Amazon, and the author conveniently forgot to mention. Most people in tech industry always strive to build monopoly and dominance. In their eyes, Warren's idea is of course insane. But viewing from another point, in order to protect competition and small businesses, her proposal…
Actually amazon is the one that I would say doesn't have a monopoly. It doesn't have a monopoly in the retail space (far from it), nor in the cloud hosting (let alone server hosting) business, nor in online streaming (music/tv). Google on the other hand has close to a monopoly on search (and browsers). Facebook on social medias.
For vendors, the situation looks different - and Amazon certainly does abuse their position towards vendors often enough, e.g. with the AmazonBasics program where they take bestselling stuff, produce it at Amazon scales and then outprice the "competition".