"you can simply sell a product."

Are you personally making a living by selling a product or service you created - and if so could you share something of your experience? Making a product is not trivial - it's double hard.

First you need to come up with a product. Then you need to sell it and the latter is possibly much harder than the technology in all except the most complex of products. There are success stories, sure, but so many people in the internet are hustling so success looks like driven by chance rather than a deterministic outcome by following a given process. (If you get to medical school, then becoming a doctor is a deterministic outcome. If you get unemployed, coming up with a product and sales to make a living does not seem deterministic to me in the same sense).