No. That is precisely the point.
None of the crap you're talking about ever actually happens. Tyranny By Corporation exists only in science fiction. Tyranny of the State has far too many real-world examples.
I don't know why you're jammed on the idea that somehow a free capitalist system prevents upward mobility when the evidence of our history shows the exact opposite. Even today, a majority of the Forbes 400 is self-made.
Gilder is talking about people who make money being able to control what they do with their own money. Why does that bother you?