A company that has a monopoly has to follow more rules than other companies because it can do more damage. Certain kind of moat-building is severely restricted

A company that has a monopoly has to follow more rules than other companies because it can do more damage. Certain kind of moat-building is severely restricted for them, such as exclusive contracts or deliberate technology lock-in, while other methods are still legal, such as brand recognition or a rich partner ecosystem or simply a superior product. >Apple guilty of refusing to deal with certain companies Apple does not have anywhere near a monopoly in any of the markets they are in [+], hence the anti-trust rules do not apply to them. By contrast these rules do apply to Microsoft and Google, for example. [+] in the eyes of the law monopoly means control of a market, and market is comprised of interchangeable goods. In this case iPhones and Androids are interchangeable - a consumer is free to buy a Samsung or an Apple phone and neither company is running the risk of excluding the other. Hence the consumer is in no danger of being deprived of choice, and there is no monopoly.