> They are competing in the free market. Users are free to not use their software and there are many other choices. Users are not free to use other software on

> They are competing in the free market. Users are free to not use their software and there are many other choices. Users are not free to use other software on Apple hardware. The operative question is how we define the market. Is the operative market "all smartphones," or are iOS devices distinct enough to qualify as a market of their own? The answer isn't clear to me, especially because there are a variety of soft barriers. Even if "all smartphones" is the relevant market, phones are expensive; it takes on the order of $1k to walk away from an iPhone X in favour of an equivalent Android device.