Warner Bros. Discovery, the conglomerate that owns HBO, CNN, and the Warner Bros. studio, has officially hung a "for sale" sign on itself. But wait a minute. Didn't Paramount owners Larry and David Ellison already offer to buy WBD? So wasn't it already for sale?Yes, they did. And yes, it was. So the right way to view WBD's announcement Tuesday morning, where it said it would conduct "a review of strategic alternatives to maximize shareholder value" is primarily a formality: WBD has rejected Paramount's bi ...