On the contrary, the claim in the original post is exactly that Google must do bad things because of some unnamed law that corporations must maximize shareholder value. Specifically:

"So, of course Google and Facebook have to erode the concept of online privacy [i.e. do bad things]. That is their product and that is the value that they are legally bound to maximize [i.e. the reason they must do bad things is because they are legally required to]."

That is what I was responding to when you responded to me. Since you are so mistaken about what exactly the discussion at hand is, I don't know how you can claim to know what is germane to it.