He could have entered the private space race against Musk and Bezos
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https://www.reuters.com/article/us-gates-foundation-buffett-idUSKCN2DZ1AF
Warren Buffett resigns from Gates Foundation, has donated half his fortune
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He has since 2006 donated more than $41.5 billion of Berkshire shares, including more than $32.7 billion to the Gates Foundation. The overall total is now equivalent to about $100 billion because Berkshire’s stock price has risen.“Over many decades I have accumulated an almost incomprehensible sum simply by doing what I love to do,” Buffett said. “Society has a use for my money: I don’t.”
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