Earlier, I wrote about ordering from food delivery services that don't deliver. A few of you wrote me with similar experiences and I got a call from a lady I know who supplements her income driving for DoorDash. She thinks she knows what the problem occasionally is. If you deliver for one of those meal delivery companies, the amount you make off each delivery doesn't vary much. But if like many of those folks, you're also out there driving for Uber or Lyft, there are moments when those companies' rates go sky-high due to increased demand. So suddenly you bail on delivering a pizza for Postmates.
Uber and Lyft can double or triple the rate to get you from here to there when they're short on drivers and that causes more drivers to hit the streets. But if many of their drivers are answering Lyft or Uber calls, Grubhub or DoorDash can't double the price of the Chinese Chicken Salad they need delivered. They take the order but they can't find a driver to transport it.
That sounds like what happened to us during Comic-Con. We had a lot of trouble getting a cab too.