"At what point of scale do people start imagining they have a right to make demands on how something somebody else built and owns should be run?" Well, presuma

"At what point of scale do people start imagining they have a right to make demands on how something somebody else built and owns should be run?" Well, presumably the point when they no longer own it and turn it into a public company with shareholders that are going to go down with the $500b ship. A quick google says that Mark owns 13.4%, not a majority of the company. So he has a pretty large voice and might be the largest single shareholder but it's no longer his -- it's not his prerogative or risk to take, if the board decides it's not. And there's a good argument that the board should replace him.