In 2010, Warren Buffett and Bill Gates launched a disarmingly simple campaign aimed at the world’s wealthiest people called the Giving Pledge : a public commitment to give away more than half their fortune during their lifetime or upon their death. The year seemed to call for it. Tech was minting billionaires faster than any industry in history that decade, and the question of how those fortunes would impact society was just beginning to take shape. “We’re talking trillions over time,” Buffett told Charlie Rose in 2010. The trillions materialized; the giving, not so much. The numbers no longer surprise anyone paying attention. The top 1% of American households now hold roughly as much wealth as the bottom 90% combined — the highest concentration the Federal Reserve has recorded since it began tracking wealth distribution in 1989. Globally, billionaire wealth has grown 81% since 2020, reaching a whopping $18.3 trillion, even as one in four people worldwide don’t regularly have enough to eat.…