The “necessary” thing of theirs is their money. If you took them out of the equation and kept the money and not worry about making more profits than last year every year, that necessity wouldn’t be there.
Jeff Bezos did not invent eCommers. Elon Musk did not invent the rocket or the electric car. They are not scientists, they are investors.
So yeah, I don’t have money to invest because, unlike Bezos, I didn’t work on Wall Street for years before funding an e-commerce site and unlike Elon Musk, I didn’t start a company with money from my father who owned an emerald mine.
Money like that is only necessary in a flawed capitalist system. And the result is the exploitation of workers for low pay, shoddy products and, in the case of Tesla, shocking racism and sexual harassment.