tl;dr: Craigslist founder Craig Newmark has donated roughly $500 million to causes including journalism, cybersecurity, veterans, and pigeon rescue, and joined The Giving Pledge in 2025 after the program expanded beyond billionaires. He publicly pushed back against Peter Thiel and other tech billionaires who have discouraged wealthy peers from signing the pledge, claiming it funnels money to "left-wing" nonprofits. Newmark, who still doesn't own a car and takes the NYC subway, kept Craigslist free for users rather than take VC money, and credits childhood lessons from Holocaust survivors for his approach to wealth.