I suspect people make that argument because they are unaware of the word duopoly. Functionally, a duopoly isn't much different from a monopoly. The market would be far better off if there were 4 or more players.
In the context of smartphones, the vertical integrations don't help with the "monopoly" perception, either. Once you've decided to get an iPhone hardware device, your only choice is to use the Apple app store, and if you want something out of the Apple app store, your only choice is to get an iPhone. Android phones are a little more lenient in that there are at least multiple app stores, but you still have the tight coupling between the hardware and the OS despite smartphones fundamentally being ARM devices with touchscreens.
Were smartphones more like PCs, you could buy an iPhone and put Android on it, then use any of the iOS, Google Play, or Amazon stores to install apps. Or, perhaps you'd prefer to buy a Samsung Galaxy S24 and put iOS on it, and install apps from any of the many app stores just the same.
I'd be at least as irritated with the PC market if I had to buy a Dell PC to access Steam and it only allowed installing from Steam, an HP PC was linked 1:1 with the Epic store, Alienware PCs were linked 1:1 with the Origin store, etc. and building your own machine was no longer possible, though at least you'd still have more options than with phones.
> Were smartphones more like PCs, you could buy an iPhone and put Android on it, then use any of the iOS, Google Play, or Amazon stores to install apps.
It's never been like that. What you wrote is fundamentally the same idea as: "If consumer computers more like consumer computers, you could buy a MacBook Pro and run RedHat Linux on it, then run any of the macOS applications or Linux applications that exist in the world."
While the mobile computing ecosystem and details are quite different, it's mostly same cocktail of things: Commercial hardware that is either open or closed, a [maybe commercial] OS, and applications that execute under version X of the OS and version Y of a runtime.
In the context of smartphones, the vertical integrations don't help with the "monopoly" perception, either. Once you've decided to get an iPhone hardware device, your only choice is to use the Apple app store, and if you want something out of the Apple app store, your only choice is to get an iPhone. Android phones are a little more lenient in that there are at least multiple app stores, but you still have the tight coupling between the hardware and the OS despite smartphones fundamentally being ARM devices with touchscreens.
Were smartphones more like PCs, you could buy an iPhone and put Android on it, then use any of the iOS, Google Play, or Amazon stores to install apps. Or, perhaps you'd prefer to buy a Samsung Galaxy S24 and put iOS on it, and install apps from any of the many app stores just the same.
I'd be at least as irritated with the PC market if I had to buy a Dell PC to access Steam and it only allowed installing from Steam, an HP PC was linked 1:1 with the Epic store, Alienware PCs were linked 1:1 with the Origin store, etc. and building your own machine was no longer possible, though at least you'd still have more options than with phones.