And then, someone needs to build cafeteria menus. And the tool to manage health care enrollment. And badging. And ultimately, you have a product that could probably be operated by a lean team of 100 people, but you have 5,000 employees to take care of all the auxiliary functions, from legal compliance to providing benefits. You need slack in that org structure too, because you don't want everything to grind to a halt when one important person leaves or takes a week off.
I don't understand why you find this objectionable. Would Google or Facebook be more fun if you were on a very small team with zero slack and constant grind, and there was no one to call if the printer is broken? Yes, it's a jobs program funded by the revenue from core services, but it ultimately makes life better for everyone?