He was a utilitarian from the cradle, an EA before he was a billionaire, and used to donate a lot of his income. Apparently Alameda Research donated 50% of their profits in the early days, too. After he became so wealthy he donated a lot of money to EA-approved organisations.
That at least seems true. It would be impossible to bribe or deceive so many people and organisations who, by all we know, _did_ receive actual money from him already.