It wasn't even that much the case with Google, where remember the board/investors installed "adult supervision" for like a decade. Facebook, on the other hand,

It wasn't even that much the case with Google, where remember the board/investors installed "adult supervision" for like a decade. Facebook, on the other hand, was always Mark's. He has had ironclad control of the company from inception to the present day. And when Facebook became the success story of its generation of companies, investors took the lesson that you always had to have the founder(s) have complete control of the company. That led to the modern trend of founder worship, which probably lasted more-or-less until Travis Kalanick, Elizabeth Holmes, and Parker Conrad swung the pendulum in the other direction.