Antitrust++

You're kidding, right? A monopoly on "web search"? What are Bing, Yahoo, Blekko, Duckduckgo and others? Chopped liver?

You have a monopoly on (or monopoly power in) a market, not in something given away for free. If Gruber had said "Monopoly power in adword advertising", maybe, but then he'd have to make his case differently.