It was a big thing for competing cab companies to call each other and schedule bogus pick ups. So much of the time they just disregarded calls until the 3rd or 4th time you call back, then they finally send someone.
I wonder if some new player shouldn't enter the market and start making fake pings with Uber and Lyft. Just entirely fill their system during peak times thus preventing them from operating. Can't be too complicated. And this is just exact type of play their customers love about these companies.