Two things that are reprehensible about this is, the fact they are paying you with money they have stolen from you. In most cases now, they are taking at least 50% of the fare amount they are charging pax.
And even more importantly, they are in charge of the ride requests you get. They KNOW when you are getting to within 80% of the quest dollars needed... how many good money making ride requests do you think you will get? And if you aren't in a super busy area, good luck getting any ride requests when you are close to finishing quest. And if you think LAX will bail you out, get ready for those MDR requests.
Uber is nothing but the scum of the earth. And pax are starting to figure this out too.