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I'm thinking more & more about decentralised p2p bitcoin based uber which cannot be ever shut down or controlled. Now it's becoming apparent that it's what world will soon need.

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If it can't be shut down, there's nothing stopping violent muggers or kidnappers from participating as drivers. If there's a feedback system, there's nothing stopping Sybil attacks from gaming it and forging reviews en masse.

You have to trust someone's opinion, somewhere.

Of course there would still need to be either reputation systems or arbitration systems. The reason restaurants usually don't plainly defraud you isn't the threat of litigation, because litigation would cost much more than the value of the transaction. It's because they rely on reputation and repeat business.

Decentralized or massively federated reputation and arbitration networks are possible. Clever people would need to figure out a way to set things up, but it's certainly not a technological impossibility.

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