Most drivers earn money based on the amount of time they spend transporting people/things, correct? I don't believe there are many drivers who get a great base

Most drivers earn money based on the amount of time they spend transporting people/things, correct? I don't believe there are many drivers who get a great base salary regardless of work output. Supply and demand would prevent people who tried to use driving as their primary income and the task would be taken care of by people willing to do it on the side when the demand is there