Three billionaires below have donated more money than their current net worth (Generosity Index >100%) and thus reduced to millionaire status. Which former billionaire is by far the most generous with an unbelievable index of 420,000%?

Three billionaires below have donated more money than their current net worth (Generosity Index >100%) and thus reduced to millionaire status. Which former billionaire is by far the most generous with an unbelievable index of 420,000%?
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