Watching a YouTube video and downloading a YouTube video are the same thing. They are indistinguishable. You can not watch the video without downloading it. Just normally you dont keep the file but each part of the video is discarded a few seconds after you watched it. I dont think YouTube ever went after users who watched pirated content, they only ban the channels that upload it.

Your ISP or law enforcement only see you are watching YouTube. They dont know which video and they dont know if you save it or not.

The system where someone monopolizes a essential good and leverages that to gain power is called anarcho-capitalism and is a whole different thing. In anarchy, ownership on that level does not exist. Neither a company nor a person can own a factory, or a farm, or the power grid. Employment doesn’t exist. People can band together and distribute tasks for a common goal (such as producing a certain good) but they all hold equal stake in all decisions.

Of course a group of people could use violence to oppress other people. But then you no longer have anarchy. The same way a democracy stops beeing a democracy once a group seizes power and doesn’t allow fair elections anymore.