(I'd just like to acknowledge that my parent comment is pretty lousy. I don't know Derek and I'm making assumptions about his motives. I feel like it's fair game after his article "Why I gave my company to charity [1]" but I'm not proud of casting aspersions on internet celebrities. I have a jaded view of philanthropy and philanthropists that may be totally off in this case.)
[1] https://sivers.org/trust