Microsoft at the time owned 90 percent of the entire computer market.
The only thing Apple has a monopoly on is things Apple sells. If it is deemed that you can have a monopoly of a subset of a market, ask yourself how this will be applied to other businesses in the future. Does a mall have a legal (not colloquial) monopoly on stores in the mall?
Edit:
If you make a game that has a store in it, do you have to let others sell thing in your game’s store. You have a monopoly on things sold in your game. Your game is a platform.
As someone who develops on these platforms, the problem is how difficult it is to get true figures for market share.
If you just search "Apple vs Android market share" you get an incredibly false picture of reality.
Android isn't just Android. It's everything from a flagship like a Galaxy S20 to a "Galaxy A2 Core" destined for low-income markets that was never meant to compete with an iPhone, and for which most app's target markets might as well not exist.
I remember a conversation with Jake Wharton where he insisted it was fine for apps to adopt the iOS strategy of dropping older OS versions extremely quickly. His reasoning the devices that have owners who spend the vast majority of money on the platform have newer devices that get updates.
To some degree he was right (not enough to excuse the absymal Android update ecosystem but I digress)
We've reached the point where even things that are comparatively used as "semi-dumb phones" show up under Android figures because of how ubiquitous of an OS it is. There are a ton of Android devices out there that are 3 or 4 major versions behind, leading a lot of developers to support them.
But if you actually look at top app revenues' (of which I've seen a few now), they consistently might as well not exist.
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For that reason, if we actually shave that down to people who are paying into the app ecosytem (ie. look at the customers of the app developers, not the customers of the phone manufacturers) , suddenly you realize why so many apps and games go iOS-first for development:
It's no contest, Apple dominates the market for actually making money off apps. Because it's not just that Apple is making more gross revenue, it's the fact they're doing it with a third of the installs(!!!)
It's a one-two punch against Android devs since, as installs scale, support and review problems scale, while revenue is not scaling at all with it vs iOS.
It's a reflection of what I mentioned above, just how many Android devices are really not iPhone competitors, and not catering to a demographic that spends money on apps.
The average developer is making many times what their Android equivalent is making per app. You can make money on Android, but if you're blocked off from iOS, you're hurting in a huge way.
The only thing Apple has a monopoly on is things Apple sells. If it is deemed that you can have a monopoly of a subset of a market, ask yourself how this will be applied to other businesses in the future. Does a mall have a legal (not colloquial) monopoly on stores in the mall?
Edit: If you make a game that has a store in it, do you have to let others sell thing in your game’s store. You have a monopoly on things sold in your game. Your game is a platform.