There is a disagreement, the first poster clearly believes Apple even having a closed App Store is an infringement, even if he can not use it. And it's honestly almost gaslighting to pretend that the first poster isn't making that argument

No, this is not true. I do not care about what Apple does with their App Store. The point is they should not be allowed to insert themselves into a relationship between me trying to sell something and someone else trying to buy it from me directly. No cost to Apple exists, thus they should not be paid. It's really simple actually.