I get it that WhatsApp and StackOverflow and Instagram have/had a lot less legal, financial, and marketing requirements. But Uber has almost 1000 times the amount of employees WhatsApp, Instagram, and StackOverflow had when they reached similar scale.
I get it that there's a lot more analytics and geospatial complexity in Uber. I get it that they have to manage tens (hundreds?) of thousands of drivers.
It just seems like there's a LOT of unnecessary fat that could be cut.
Facebook only had 4k employees when they IPOed. Google had only 1,900!