[danogentili]

You listed around 4 competing stores in your example, but Apple explicitly does not allow anyone to compete with their own store (except for in the EU, thanks to the DMA, and even then they take their cut, see below).

Another issue with the analogy is that when you buy a PC in a physical store, that store does not continue taking a cut of all software bought on that PC using i.e. unrelated digital stores (but that's precisely what Apple is asking from competing stores in the EU).