It doesn't need to be. MS in the late 90's dominated, and you could not do work with someone using MS products unless you also used MS products. One person having an iOS device and another having an Android device does not cause any issues between the two, they are fully able to communicate by the nature of cell phones. I would bet that the lawsuits against MS would not go through if they were brought up today (and, of course, MS was still doing the same things), because it's actually possible to switch desktop operating systems without ending up unable to collaborate with your coworkers and family.