Sure, and by existing laws and court rulings they haven't done anything wrong except be a preferred choice by many consumers. This is not comparable in any way to antitrust transgressions that got Microsoft in trouble, nor do they have the market share to manipulate that's comparable to what Windows or Google have had.
FWIW, I also want a more open iOS platform, but I don't think you can demonstrate that they run afoul of any existing antitrust laws or prior precedents either and trying to redefine what a monopoly means, exclusively to to the iPhone, is never going to work.