They still find plenty of unfairness in Uber from the individual to Uber relationship, such as the fees for one, but there seems to be less injustice between fellow drivers compared to traditional firms.
But the drivers do, which is a source of complaints in places where taxi service is considered to be an extension of public transport. Uber-like companies (it's not just Uber, MyTaxi/FreeNow suffers from this as well) are notoriously unreliable if you live in or want to go to places further away from the city center or otherwise inconvenient for the drivers, or if your start or destination suggests you might be inconvenient to handle. For instance, I've had trouble getting a ride to a maternity hospital in the city center, and only got one after I switched the destination to a nearby beauty salon. I confirmed this when talking later with the drivers over other rides - they see the requests to/from hospitals, they just skip them.
In this way, an algorithm is fairer than dispatcher for the drivers, but the dispatcher is fairer for the passenger.
The algorithm is the dispatcher, and theoretically, would weed out drivers that discriminate after a certain number of incidents. I don’t see why a human dispatcher has less reason to discriminate than a driver. Presumably, discrimination is to maximum use revenue, which is in both the driver and dispatcher’s interest.