Haven't Bill and Melinda Gates committed to giving away 99% of their accumulated wealth upon the deaths? I don't really see an issue with their personal fortune growing at a rate faster than their charity foundation so long as they follow through with their promise to give almost everything away eventually.
That said, if I were in Bill's position I'd want to see first-hand the benefits of my philanthropy come to fruition before my death, so perhaps he has plans to accelerate contributions to his foundation as he gets older?
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