There is a very long list of corporate titans that went out of business due to a startup. Blockbuster is the first that comes to mind, but Borders, Eastman Kodak, and General Motors each went bankrupt due to holding onto their dinosaur legacy ways. Where is Dupont or Alcoa? Look at the DJIA from 50 years ago compared with today. Replaced with a lot of startups.

As for major corporations being too big. I actually agree. So is government. So if you will endorse a bill limiting the size of government, then I will endorse a bill limiting the size of corporations. After all, every single evil and greed and unlikeable quality you say about billionaires, can be applied to presidents. About corporations, can be applied to governments.