Earlier quoted context omitted.
Profit is a function of competition. If Apple had competitors, it would not be able to charge as much as it did for its computers. You argue that Apple does have competition, and that's nominally true if you are very coarse and sloppy with your comparisons, but due to marketing and their walled garden, they are basically a monopoly over the upper / more artistic portions of the market: https://wccftech.com/apple-ipho…
Profit is a function of competition. If Apple had competitors, it would not be able to charge as much as it did for its computers. Are you really saying that Apple has no competition in computers ? Apple has been competing against commodity PC makers for 40 years. Or are you saying that Apple doesn’t have competition making MacOS computers? Apple competes with generic PC makers by making a differentiated experience .…
Of course not. A company need not have a monopoly in every market they compete in. For example, Apple produces an office suite (iWorks), but due to the competitive nature of that industry doesn't make money off of it.
Apple doesn't have a monopoly on computers, but it does not make much profit off of them. Most of its profit comes from smartphones, where they do have a monopoly on the upper portion of the market, and also within their own walled garden.
For example, in 2015, 50% of Apple's revenue was iPhone: https://www.businessinsider.com/heres-where-apple-really-mak...