It's hard to argue with the claim - if you have an iOS phone or tablet, for example, it is a monopoly, since it's the only place you can buy a program for your computer. The walled garden has real benefits in security and privacy, but seems to require centralized control, and comes at the expense of user freedom. A solution to the monopoly pricing problem could be to treat app store controllers (currently A & G) to t…
I don't even buy the "security" argument; MacOS is a highly secure operating system, produced by the same company, which has no forced walled-garden App Store. There certainly are exploits and scams which happen; just like on iOS. The argument sounds great in theory, but in practice, it simply doesn't hold water; security & privacy can (and should) (and does) happen at the OS layer, not application distribution.
The iPhone is also much higher stakes than MacOS in terms of total number of users affected by any exploit.