This can be done with ETH smart contracts in a totally decentralised way, even with Aragon governance. There should be some kind of trust/rating system as well.
This can be done with simple bitcoin based website without the need of a shitty smart contract based on Ethereum.People don't want to deal with all those gas complexities when they can keep things simple and straight forward.
Use the same concept of localbitcoins to your idea -- An automated escrow that holds payment and a service provider that does things for bitcoin.Escrow is released after the job is done.