He’s set for life financially. I must wonder if he enjoys collecting info for a cause near and dear to him - perhaps one you and i might not like. I think much of what we say, do, watch online can be psychoanalyzed, but, for the most part, talk is cheap and many of us (myself included) talk toough online, but our actions are far more civil. I must also wonder how much better a virtul reality could psychoanalyze individuals and maybe groups or society as a whole. I’d guess increasing the control we think we have online could helpthe feds flush out who will give them a problem, who will not submit, who thinks independently, and who has the skill set and IQ to be a real threat.
Allowing us to move and puttings us in situations (online games) that may make us act impulsively or when we are forced to think and act quickly - that should be a great determinant of who to watch. Zuckerberg already had so many users via FB, WhatsApp, and Instagram, so it made sense that he could pull in more users than another company or game.