The Giving Pledge — the campaign Bill Gates and Warren Buffett launched in 2010 to get the ultra-wealthy to commit more than half their fortunes to philanthropy — marked its 15th anniversary in 2025 with more than 250 signatories from about 30 countries. The milestone drew scrutiny: an Institute for Policy Studies analysis found the pledge largely unfulfilled in practice, with many signers far wealthier than when they joined and much of their giving routed into private foundations and donor-advised funds rather than working charities. Supporters credited it with normalizing large-scale giving; critics questioned its real-world impact.