Look I don't know about Taco Bell, does it come installed in your car, like you push a button and a taco comes out from your dashboard? Because that's the only case this terrible example makes sense.

If you get a job through a phone interview, do you owe Apple 30% of your salary? No.

Using your phone's services doesn't cause Apple to get a cut of anything that happens while you do so. Selling apps THROUGH ITS OWN STORE does.