Effectively every restaurant in the US has to pay either PepsiCo or Coca Cola. Similarly, if you want to buy a non-alcoholic beverage at the grocery store it's mostly down to those two (with Dr. Pepper having a much smaller but still significant stake). Any competitor that emerges just gets bought up by one of the three.
Apple's half of the phone Duopoly. Either you pay them or pay Google if you want a phone and want to buy software for it.