Colombia is a highly regulated market but the taxi drivers manage to modify their fare meters to charge you more (either they are accelerated or they have a switch that makes it accelerate), they lie to you about the costs (if you are not from here hey can tell you a trip that is 18 is 35, like they tried on me). In fact, it is estimated that 80% or more of the taxis here would try to rob you. I agree that Uber goes against regulations, and their new dynamic fare is a steal on its own right, but the service is much more better than cabs.