Microsoft was hit with monopoly on browser even though you can install anything or go buy a Mac.

But when you control a huge portion of the PC market, and you put it in by default, you are cascading your monopolistic benefits down to installed software.

Apple does not have complete domination of smartphone across all demographics, but they do have domination in many segments.

For example, it is estimated that around 88% of teenagers have iPhones. Apple makes it very hard to leave their ecosystem because of iMessage, Facetime, and ALL of your digital purchases being tied to their ecosystem. So, what happens when all those teens grow up? Do we really think they will leave Apple ecosystem?

What cascades from that is a long term digital domination strategy, and when you have that only one digital store option, now you have a monopoly argument.