Lyft/Uber. They had a strategy of eliminating their taxi company competition by flooding the market with such low fares that the taxis couldn't compete. That said, the taxi companies had a miserable reputation in many cities. They often came late or not at all, they usually required a phone call to dispatch, and they were quite expensive. But still, the tactics Lyft and Uber used to gain market dominance was dirty and monopolistic.
The flip side of this is that I can avoid the trap of car ownership, with all of its problems and expenses.