Here in Australia theres a never ending steam of complaints about taxis managing to bill passengers extraordinary amounts. From taking a route that deliberately includes a highway leg thats expensive to correct (screws tourists), to demanding higher fares, to card skimming, to outright just not displaying the taxi licences so you cant complain and have no idea which driver was being creepy.

Uber at least has fixed rates from what was displayed and there are logs of which driver was doing dodgy stuff.