These drivers are looking for any way that they can to make their work barely profitable, because just letting the algorithm "Manna[1]" them around a city ends up being barely break even after all costs are added in.
So that's why you get the calls asking where you're going so they can get long trips (especially around airports), the "oh not I got into an accident, can you cancel the trip?" calls, etc... Not to mention the drivers who are stuck with high interest loans on cars from Uber.
It's marginal labor inputs for a marginalized workforce - and an increasingly immigrant one, which is great generally but correlates to the easily exploitable. So while I don't condone this kind of behavior, I can see why they would feel pushed into doing it - especially if it's relatively retribution free.