All business is about establishing trust. But standard practice in business is never to expose yourself to undue risk. The business side of ride sharing just doesn't compute, because the benefits don't outweigh the risks of letting someone else drive your car in exchange for money.
Businesses carry insurance, and they operate under a completely different tort of liability. A well operated business will never risk sending employees to jail because a car they rented crashed. They may be fined, but you would need to prove willful negligence to get a criminal charge.
On the other hand, lending your car out as a individual exposes you to massive civil and potentially criminal liability. You don't have to literally booby-trap your car to be charged, you could be charged merely for a component failing at the wrong moment (hindsight is 20/20, and juries are people).
What? Trust is the very bedrock of civilization. You trust people in little ways every second of everyday. You trust the mailman isn't reading your mail, you trust the coffee at the diner isn't contaminated, you trust the health inspector that inspected that diner, and so on.