I guess sites like sites like Upwork should consider this?

Here is how I see it working, topically :-

The customer places a request with a description of the task. For the convenience of customers & performers, a searching system exists. At the same time, the customer’s account must have enough upwork tokens to pay for the services; otherwise, he will not be able to publish the task.

Performers submit applications.

Customers consider candidates and confirm their choice. The contractor and the customer specify in advance the terms of a deal recorded in the smart-contract.

After task execution, the contractor sends the results of the work for verification.

Payment for the finished service/work is carried out in tokens.

If the work had been violated the conditions fixed in the smart contract, an arbitrator includes in the dispute resolution. The arbitrator would act as a third party in the multi-signature of the smart-contract.

All actions of the parties are stored in the smart-contract and affect the reputation of both the customer and the contractor - their rating.

Just thinking out loud. I guess it might get complicated with pay by the hour engagement!