Earlier quoted context omitted.
Taxi drivers are almost certainly mostly employees. "Contactor" is a kinda arbitrary employee status which has some theoretical usages - but most of the time it's just abused to deny employment benefits from employees.
All of the taxi drivers I knew in SF when I lived there rented their taxi for the night, up front.
Independent contractor status is a really finicky thing to define and, in the end, it's a status that mostly deprives employees of rights in favor of an employer so any "grey" usage of it should be highly suspect.