It must? No, it doesn't have to do a damn thing. It's a product from a publicly traded company, therefore it "must" return value for stockholders. That means more behavior that increases ad revenue. The author is out of touch with reality. Stop feeding your kids youtube if you don't want them exposed to youtube. It's a private service(youtube), not a public park.
Of course, it is incumbent on us individually to behave responsibly. But there is space for public policy and regulation, even of YouTube.