A) Some places have laws to ban unlicensed taxis, while others do not. C) Some states have laws to ban auto-makers from making direct sales to consumers, while

A) Some places have laws to ban unlicensed taxis, while others do not. C) Some states have laws to ban auto-makers from making direct sales to consumers, while others do not. You have attempted to make a distinction, but not a principled distinction. There is no reason (that I have seen) which explains why unlicensed car dealers are less harmful to the public than unlicensed taxi drivers.