I don't like seeing stuff like this, it's indicative of why I wasn't a huge Clinton fan before she became "not Trump."
But this is not remotely close to the "hands in the cookie jar" revelation you guys think it is. It's a fairly inconsequential and not particularly influential board that has an undetermined # of members (up to 30), so it's not like he took a job from someone else. And they are supposed to "reflect a balance of backgrounds, points of view, and demographic diversity and shall include a wide variety of scientific, military, diplomatic, and political backgrounds," which if nothing else gives her adequate cover for why he was chosen. Looks like your standard issue "get an interesting side gig for a friend" type deal.
And there's zero chance it was a quid pro quo deal, because there's nothing all that prestigious about the gig, and the pay tops out around $150K even if he's full time, which is presumably less than his donation to the Foundation considering the media has labeled him a "major donor." In other words if this was a quid pro quo that would mean that he effectively paid to work. He'd be the dumbest influence buyer ever.