No. As you yourself recognise (presumably, as you put the "must" in scare quotes and italics), that companies "must" maximise shareholder value is a goal contingent on our decisions and policies, not some natural law.
Of course, it is incumbent on us individually to behave responsibly. But there is space for public policy and regulation, even of YouTube.
Of course, it is incumbent on us individually to behave responsibly. But there is space for public policy and regulation, even of YouTube.