Consumer harm is pretty easy to argue, Apple doesn't tax macos programs but it does tax ios programs. That argument results in billions of dollars of consumer harm. There are many arguments against that view as well, but I just wanted to show that it is easy to argue for consumer harm.
I don't think that's enough though is it? To my mind the strong counter argument is that consumers are choosing to pay higher prices for "higher quality" (i know that often not the case with the scams on the app store) apps and if they want cheaper apps they are free to switch to android.
