TL;DR: Aside from clarifying what the terms "public utility" and "common carrier" mean, the article's main argument is that Google's customers are the advertise

TL;DR: Aside from clarifying what the terms "public utility" and "common carrier" mean, the article's main argument is that Google's customers are the advertisers, not the visitors to its search engine, and that there's no reason to expect them to treat all advertisers equally.