Sorry but you don't seem to understand how antitrust law works. Today, in the US and many other parts of the world, Google has a monopoly in the search market. Google is using their monopoly in that market to influence a second market (any one of a number of content verticals). It doesn't matter whether the service is free, or not free. Influence and unfair competition - this is the definition of antitrust. (How can any SEO or SEM expert ever compete against Google itself for search rankings or ad placements? They can't.) Microsoft tried to use its monopoly in OS to influence browser choice, and was rightly persecuted for it; this case is not much different.