https://docs.oracle.com/en/browseall.html
So when you dig in you can easily see what all those people work on.
Whereas, Uber is basically two services (ride sharing and food delivery). So there it's a bit harder to understand. Of course they're in lots of markets and have a huge human support surface area because of all the drivers and riders. Probably most of those employees aren't working on the products.
Because it's a legit question, like if a companye can lay off thousands of people and still run their service, what were they all doing?
The amount of people working on regulation, compliance and other non-revenue generating responsibilities increases substantially.
I work with regulations because I'm in charge of IT at a small but busy healthcare provider. We're like 3 people who handle ISO certification and NIST compliance, on the side.