It's a widely-held misconception of antitrust law that it only applies to a de facto monopoly. Antitrust laws in the US tend to deal more with anticompetitive b

It's a widely-held misconception of antitrust law that it only applies to a de facto monopoly. Antitrust laws in the US tend to deal more with anticompetitive behavior that abuses a dominant position in the marketplace – by a business with or without a monopoly. The question then becomes not "does Apple have a monopoly," which it obviously does not, but rather "is Apple abusing its position in the marketplace," which leads to the much trickier question of where to draw the line between legitimately using a dominant position and abusing it.