I think nobody can control or own the bitcoin system like they can not control and possess the technology by email and the internet. I think Bitcoin is no different than a mobile application or program that offers a personal Bitcoin wallet and allows users to send and receive Bitcoin.
You are right about that no own the bitcoin system but you are wrong with nobody can control it. Bitcoin can be controlled and the controllers are the user of it. So how do we know if how bitcoin systems works? It is a decentralized system that no one can control it even the government. But in terms of its price, bitcoin can be controlled. A lot of people who earns a lot in bitcoin or should I say those wealthy person, sometimes they manipulated the bitcoin price so they will get benefit of it.