Generally the type of people who make good founders have to be dreamers to believe that their crazy idea not only can work but can change the world.
These people do not make good leaders as the company matures, as it now needs certainty for investors and detailed plans and structure instead of moonshot fantasies.
The same traits that make them good founders also make it difficult for them to let go of their position, or recognize that they should transition control to a better suited candidate, so often they must be removed by the board.
Source: Software Engineer in a tech startup
Highly recommend the podcast 'It's probably not aliens' if you want to find out more about the real history of the claims made in these kind of shows, and how the claims of aliens are often rooted in racism and colonialism