Isn't Norway only for drunk driving? Finland has it for massive speed excesses, but it is based on net taxable income taking out business expenses for taxi drivers, and Waymo is still negative.

If they become profitable you'd want to normalize by number of miles, unless you just want an incentive system to get more people on the road (extra drivers) and increase chance of humans suffering road injuries to boost employment in an internal service sector.

But even then coming out with a more efficient fleet than a competitor for higher margin would be penalized. You'd rather disincentivize skimping on safety for margin and not disincentivize better maintenance and fuel economy.