Amusingly, there are two sets of people arguing about why Apple is bad, and each have their own argument: 1. Android sells more, and offers more variety of mobile and wearable devices than Apple. And here’s the data to prove it. 2. Apple is a monopoly/monopsony and should be forced to allow more user choice of apps, allow sideloading, lower their prices, lower their app store cut, &c. Which one is is? Apple is like T…
Companies don't have to literally be the only buyer in a marketplace to wield "monopsony power." If competition isn't perfect — like when there are only a few companies in a market and they aren't undercutting each other's prices — companies gain some ability to lower the price on the stuff they buy. Sellers don't have a lot of other options.
Apple might be profiting from its monopsony power in the app market. In this argument, the company is effectively the sole buyer of Apple-compatible apps and services, which allows them to set their fee as high as they want.
Both of this are new argument from "monopsony" perspective, which is different to all your listed point above are "monopoly" perspective.
Not saying I agree or disagree with his monopsony thing, since it is completely new word to me.