There's no "claim" - those donations and the records of the foundations are a matter of public record.
Also, completely liquidating and giving away his assets would result in a large payout once.. and then nothing ever again. You need money to make money, so holding onto some to appreciate in value (investments, interest, etc) results in more money being donated over a longer amount of time.
Also, completely liquidating and giving away his assets would result in a large payout once.. and then nothing ever again. You need money to make money, so holding onto some to appreciate in value (investments, interest, etc) results in more money being donated over a longer amount of time.