Not really relevant, it's not the revenue that is a problem. It's their massive network effects that are, as the author puts it, platform monopolies. Walmart,

Not really relevant, it's not the revenue that is a problem. It's their massive network effects that are, as the author puts it, platform monopolies. Walmart, Toyota, Apple, do not have entrenching networks that lead to a monopoly. You can just as easily go to Target, buy a Honda, or get an Android phone