Some of Silicon Valley’s biggest names are digging deep into their pockets. Elon Musk has promised to give every child in America a share in SpaceX next year. That would amount to roughly 72 million shares worth $10.5 billion at recent prices. It’s a generous offer, although each child would receive about $146, a tiny fraction of Musk’s fortune, which has recently topped $1 trillion.

And Musk isn’t alone. Anthropic, the AI company behind Claude, recently unveiled plans to set aside 5% of its shares for public benefit. Based on its most recent funding valuation, that stake would be worth roughly $48 billion. Rival OpenAI has also pledged billions toward charitable causes.

The sums are eye-watering.…