Because of the obvious privacy implications, as well as the negative impact it has on the perception of driving. When you enable very precise insurance billing

Because of the obvious privacy implications, as well as the negative impact it has on the perception of driving. When you enable very precise insurance billing you get all sorts of weird behaviors like “I don’t want to drive through there because I’ll take a hit on my rate” or “slowing down to stop in a way people expect me to is consider a mark against me by the insurance provider, so I will do something surprising”. I think Tesla has (or used to have?) a “driving score” and it often incentivized bad driving that was locally “good” but bad in the context of everyone else on the road.