What in the world did Uber ever need that many people for?
"Well see, we discovered a hose that money pours out of. It's called 'online advertising'. Now what we do is spend half our effort trying to make the hose pour faster, and the other half trying to find another hose."
Uber figured out the 'Uber for X' pattern. Now they're trying to optimize it, and figure out something else that makes money.