Why is being able to "capture the market" something we want to encourage? This leads to monopolies or oligopolies and makes possible various types of abuse that a free competitive market would normally correct.

If you're going to step into the role of managing a large percentage of public internet traffic, maybe you need to be held to a different standard and set of rules than a startup trying to get a foothold among dozens or hundreds of other competitors. Something more like a public utility than a private enterprise.