I don't mean to sound snarky, but I can guarantee you that is a far from conventional view among anyone who has even a whiff of experience in economics.
Maybe the HN crowd is different, but I never heard otherwise in discussions during the Microsoft anti-trust trial, earlier with IBM, current discussions about Amazon, other large companies, Standard Oil, etc.
Aren't those monopolistic companies noteworthy because their monopolies were so exceptional? 99% of companies never get big enough to cause griping about monopoly.