Earlier quoted context omitted.
Could you ever consider that Zuck has enough money, and that he really believes in making a product to connect people for the greater good and use ads to make it available to everyone?
As a person, maybe if I squint very very very hard. Legally, he has a duty to maximize value for his board and investors. And there hasn't been a business model that provides a free consumer web product without monetizing user data.
Citation needed!!!
It is not illegal to have other goals than maximizing shareholder value.
For example, Costco. Publicly traded company but the employees are paid well, customers are well taken care of, and the CEO is rewarded for this. In the short-term, Costco could generate an enormous amount of value by automated, reducing wages, and finding cheaper supplies and lowering quality, selling their customer's membership information, etc.
But they don't. And there is nothing illegal about it.