Microsoft is now worth more than Apple, and it used to be in the target of government regulators. What has it done right?
I'm not sure Apple can claim a monopoly the same way those other three can. How would you "break up" Apple when their business is largely focused to one market that has strong competition?
For example, Spotify would have to pay 15-30% of its monthly subscription fee if user paid it through the IAP (which is why Spotify doesn't offer that option), whereas Apple music can do so without the 15-30% fee. Also, Spotify is not allowed to include a link to its website to pay for subscription, because it's against the Apple app store rules. The same applies to Netflix and other digital content/service providers. Apple either gets the 15-30% price advantage, or it gets the added convenience of In-App purchase for the service.