> Why, for example, all the Musk's "extravagances" are not ground for a CEO termination?

This has less to do with the relative social morality of his behavior, and rather that he has more control over the boards of his companies, and his personality represents a larger percentage of the perceived values of his companies.

Meaning that the desire and leverage for shareholders or the board to actually punish him is significantly less. Shareholders would potentially be evaporating trillions in speculative market value that is not backed up by Tesla or SpaceX's actual business fundamentals.

And any shareholders who disagree with his behavior have had plenty of time to leave and take their earnings by now, which means that the remaining shareholders are a self-selecting set who is okay with his behavior as long as it keeps making them money.