You're one removed from the actual decision makers. The real decision makers are the elite who own the licenses for the taxis. In my city, there are two families who have the bulk of the licenses and if I am not mistaken, 100% of the share of licenses for taxis allowed to operate at the airport. If you think this is about regulation, you are sorely mistaken. Or another way to think about it: regulation is about protecting profits, not consumers.