Eventhough Elon made his first millions in fast growing tech sector, he made his billions only by leaving it and starting businesses in sectors declared death. Electrical cars, personal space flights and private roads were pipe dreams, all costing fortunes in up front investments and very likely to fail due to massive establishment companies in the sector or draconian regulations. Yet he pulls it off, all at the same time, by combining high tech with focus on customer friendliness, building the total experience, from how you open the door to how the engine works, breaking many conventions on how to make & sell cars for example, direct to customer, no dealers, no marketing, payment upfront before production has started. Focused on delivering products people love and are willing to pay premium prices, years of wait time, and still containing many bugs, unavoidable for ground braking new stuff, and only possible if you have little to no competition as you are the first and only one offering it. Check out movie 'The Aviator' with Leonardo DiCaprio, about spectacular life of Howard Hughes, the last big multi company entrepreneur before Elon Musk