Is that $21/hr in revenue or $21/hr in profit for the driver? If the mileage cost is the $0.58/mi stated in the article, then the cost of driving ~15-30 miles

Is that $21/hr in revenue or $21/hr in profit for the driver? If the mileage cost is the $0.58/mi stated in the article, then the cost of driving ~15-30 miles in that hour is $9-17.