You hit the nail on the head. I'd add moderation to that list. Also, when you're in revenue mode and scaling from 14M users to billions it's no longer sustainable to outsource most of your infrastructure - OS, storage, other basic services - to a cloud provider. So you're going to need people to develop and manage those, even if you tell yourself you don't have to count them because they're elsewhere in a large company (as I was once). Then you have things like observability tools, non-trivial deployment tools, etc. that are also Other People's Effort.

Don't get me wrong, I think it's great that we live in a world where there's infrastructure lying around that makes it possible for a three-person team to achieve so much so quickly, and that team deserves a ton of credit for doing it. But it's not the "these companies are so bloated" lesson that some people are going to try to take away from it. That's just Tall Poppy Syndrome.