The people that visit Las Vegas don't vote in Las Vegas, so what incentive is there AT ALL for the government to protect the customer? This is basically the worst edge case for a regulation: the regulators only receive votes from one side of the arrangement, so who do you think they'll bias? Unless taxi abuse got so bad that it actually affected tourism, then I assure you it will always slip between the cracks. On the other hand, a business that cares about solely this problem will actually figure out a way to solve it.