If you have relevant details regarding his giving pledge I'm interested to learn them.

But rot, self interest? Not everybody can't do no evil. If he goes through with his pledge (which I assume) he will have done a lot of good. And he will have done it voluntarily. Doesn't make hime a saint, but...

(..almost ;-) - i'm joking; btw, did/will Steve Jobs, Larry and Sergey give away such a substancial part of their wealth?)