I've worked at Twitter, Facebook, Uber and Amazon. Of them, Twitter and Uber were wildly over provisioned in engineering headcount. Amazon was under provision

I've worked at Twitter, Facebook, Uber and Amazon. Of them, Twitter and Uber were wildly over provisioned in engineering headcount. Amazon was under provisioned in most of AWS. Guess which ones had massive in-fighting over projects and ownership, and which one just got things done?