I agree with you in that there is no Apple monopoly. What people are seeing may be something monopoly like because Apple is able to attract an affluent user base and then keep most of it over very long periods of time.
In some ways, from Apple's point of view, Android does not exist! Android is not the same thing Apple is, and most computer manufacturers are not doing what Apple is doing with the Mac either. Sure, a computer is a computer and a phone is a phone, but Apple has a far greater control over it's product than it's competition does, except perhaps Google.
Apple likes to sell products to people who will value them in the same way Apple does. A big part of that is Apple makes awful nice stuff! And unlike many other manufacturers, Apple asks for some money on every last bit of that value and Apple gets that money because it is all real value.
I'm typing this on an M1 Air that I got for a song. It's a sweet machine! I said the same thing about the last Mac I owned and used regularly too. Got that one for a song as well. From Apple's point of view, I might as well not exist!
I only value some of the things Apple does and that means I'm unwilling to pay what Apple asks for it's products, despite being a fan of said products.
We get along just fine too. I'm not paying what Apple wants and I almost never use the app store either. I have the software running on the machine that I want to run, and I can write the programs I want to write, use the peripherals I want to use enjoy media I want to enjoy, on the machine I want to enjoy them on. No worries.
Unlike many who disagree with Apple on value, I strongly support what Apple does and how they do it. It doesn't impact me one bit, or if it does and let's be real --it probably does, then I don't really notice. From there, it's a hop and a skip to who cares? I sure don't.
Most of the time when I see someone saying Apple is a problem, it boils down to a few great features, or how sexy the hardware is, or some other similar thing, and how that thing just should not cost as much as Apple wants to charge for it. Or I see someone point out how the BOM doesn't seem to add up in their view, and how that means over the top margins that "the market" does not support meaning something has got to be wrong, rent seeking, monopoly, SOMETHING!!!
The truth is so much more simple and I've already said it:
Apple puts value into it's products as fully as they can and Apple charges for all of that value and the fact is there are plenty of people out there who see that value and pay up.
They didn't get ripped off.
They didn't get abused.
They are not the victim in any way really.
Apple made a nice, high value product and people saw that value and paid Apple for that value.
Personally, I see it all break down this way when we look at prospective users and value:
The top isn't worried about money and they like nice stuff which makes an easy, high profit sale for Apple. Many of these people will buy all Apple.
Upper percentiles are also not worried about money, but are more practical. "nice stuff" isn't an easy sale to them. These people may buy all Apple, but are also pickers and choosers, maybe skipping Mac computers and buying iPhones. These are the most vocal complainers.
Middle of the road prospects can be worried about money, with more worried now than we may have seen in a long time. They generally do not buy products because they are nice, though attractive to them. They do buy products because they find them useful and are always looking for deals.
Lower percentiles will not typically buy Apple products new and do worry about money.
While it's more complex than that, I find the rough brackets of people useful.
Notice one last observation made possible by looking at this through the simple lens I just made:
Apple sells most of it's products to the body of people who are willing and able to pay the most, no worries! These are the most profitable customers. Others may do twice the work Apple does to put a similar amount of money in the bank!
This can look like some sort of monopoly or aberration in the market.