Most people don't know what Ubuntu is, I don't think anyone disagrees with that. The argument this article is trying to make is that millions of people use it w

Most people don't know what Ubuntu is, I don't think anyone disagrees with that. The argument this article is trying to make is that millions of people use it without knowing it, either directly or indirectly. For example, Uber has millions of users, this is a fact and so millions of people use Ubuntu indirectly so it's definitely more than 10,000 people. That's the point of the article and it makes a good case. Not saying this is a great metric, if we're talking Ubuntu on the desktop which is what you're thinking of it seems, then the numbers must be very much lower than that but total of real people using it on both the desktop and the server directly is probably above the million mark though.