The point is to explain what people mean when they say that nobody becomes a billionaire by their own effort alone. It's impossible for one, single human to generate that much value. Notch just got incredibly lucky.

You have a good point about the difference in risk versus reward of entrepreneurship compared to a job. People often choose the job because the alternative is destitution. It's not a free choice. Rates of entrepreneurship are much higher in countries that have a robust social safety net. Places like the U.S. actually have a relatively low rate.