Earlier quoted context omitted.
Presumably the duties of a Silicon Valley board member would center on running a Silicon Valley company, which a Silicon Valley CEO would be uniquely qualified to do.
This is exactly my point. They brought someone in who presumably is going to see Monthly Active Users as the metric to live or die by when what the world needs from Reddit/Twitter/FB is a more social-good focus. It might be worth it to shed a few users and lose a few ad dollars to make positive change on their platforms but with a Silicon Valley CEO on the board that is unlikely to happen.
These days, profit and social good are rarely aligned.