How tech billionaires are turning on the Giving Pledge, promoted by Bill Gates and Warren Buffett; Peter Thiel says he privately told ~12 signers to undo it (Theodore Schleifer/New York Times)

Theodore Schleifer / New York Times:
How tech billionaires are turning on the Giving Pledge, promoted by Bill Gates and Warren Buffett; Peter Thiel says he privately told ~12 signers to undo it  —  Just a few months after Warren Buffett convened a series of high-end dinners across America to collect signatures for something called …