But the Internet doesn't work that way: if Level3 shut off their peering with Comcast, Level3's customers would just find another transit provider and route around L3 because those companies are still in business to make money. They don't care about squabbles between Comcast and L3; they just want their monetized traffic to get delivered. The last-mile customers probably wouldn't even notice; but Level3's customers would likely be forced to pay more for transit from another company. But they would still pay.