There are many factors that are relevant to the question whether Apple has a dominant market position and these actions would/should be limited by antitrust laws, or if their competitive actions are within the bounds of fair play. These two factors are not.

The rights and legal limitations of Apple (regarding App Store) and Microsoft (regarding Xbox) are exactly the same no matter if iPhone or Xbox is considered "central to modern life" or not; and whether the hardware was sold at a loss. These aspects are simply not relevant for the antitrust case, they should not and would not change the decision.