A useful example is craigslist: a company with virtually no innovation for decades that still dominates the classified listings space. Other companies that try to offer a better experience face the hurdle of creating their own network or attempting to scrape craigslist’s items (and then being kicked off by their lawyers). What regulation would allow meaningful competition? A policy that requires craigslist to provide an API to competing firms for reading and writing at a reasonable price, and a requirement that changes to the network not favor craigslist vs. other firms.