That's true, but Uber/Lyft is not sharing a car -- you're being paid to take someone from point A to point B. You're not letting them take your car, use it, and then bring it back.
I understand your point, but why even mention Uber when the parent specifically said "car sharing"? Likewise, why does the parent bring the topic of "house sharing" when Airbnb is clearly renting, and not sharing?
I just feel that too often we are putting professional services and sharing on the same bag, which I find a bit alarming.