Companies like Amazon are efficient leaders in their segment. Was it just the first movers advantage? Or could a random parade of CEOs have achieved the same thing?
I think a more useful question is, should we allow billionaire's that don't produce anything. Seems like inheritances, manipulating the stock market, and related aren't actually benefiting the world compared to Amazon or Tesla.
If you have 50-100 million dollars, you've more than made it financially. So "no one should be a billionaire" should come with "where do you put the threshold?"
It would also seem very difficult to prevent people from being shareholders in their own companies. Most of the wealth of e.g. Bezos comes from his Amazon shares.
Now of course that Tesla has demonstrated that it can be done, there's many similar attempts (like Rivian). It's not clear to me that we could have a Tesla without having Elon much with a few billion in his pocket.
AC Propulsion (1997) tried producing the t0. https://en.wikipedia.org/wiki/AC_Propulsion_tzero
In January 1996, Corbin Motors began work on developing an electric vehicle. The Sparrow passed final testing for Department of Transportation certification in April 1999. In September of that year, the Sparrow production line began manufacturing multiple vehicles in Hollister, California. - https://en.wikipedia.org/wiki/Myers_Motors
They weren't successful, but that's different than your point about "nobody has started a new car company in the USA in many decades".
https://en.wikipedia.org/wiki/List_of_electric_cars_currentl...
Is amazon not successful because for most of their existence they have invested in growth over taking profits?
https://www.forbes.com/sites/jimcollins/2019/01/18/teslas-pr...
As far as Amazon. It’s still doubtful that Amazon retail will ever have the margins to justify its value. AWS on the other hand should stay a high margin business.
https://www.fool.com/investing/2018/04/14/is-amazon-com-reta...
Have you read the history of Tesla? Elon Musk didn't start Tesla...