Yes but I think his argument is that ranking apps by volume creates an incentive to compete solely on price in order to get the volume in order to get the visibility in order to get the volume... Kind of like if expensive low volume laptops at an electronics store were stacked away somewhere in the basement.

But I don't agree with his conclusion that this is not a free market. Every market is organised according rules that someone artificially creates. It is up to sellers and buyers whether they want to use that market or not. So there is a market of markets and that's what makes each of them free.

Of course Apple's dominant position in that particular market of iPhone app markets is a problem for everyone. That's why I would think very hard before I creating apps on top of someone elses proprietary platform. I'm not saying I wouldn't do it or that it's somehow unethical. I'm just making the observation that these are the problems that come with proprietary platforms.