He's been giving his money away for many years now and strangely is still one of the richest men in the world. I suspect that his desire to not give his kids money will work out much the same way - he gives them "only" $10m (of course, enough to live comfortably on for their entire lives) - but also, control of some billion dollar philanthropic fund.
Not to mention that he probably owns a lot of stakes in tech startups, which have, on paper at least, appreciated quite dramatically in recent years.
I think Gates is probably to the point where it's functionally impossible for him to give away all of his money. The value of his personal brand and network is such that startups will probably give away decent chunks of their business just to be a part of that network.
He's still worth a shitload of money just by being him. His name, brand, network, intelligence, and the cache of knowing him are worth a lot of money. That's wealth that is inherent to him, thus can't really be given away, and could be tapped at anytime.
He could walk away from everything tomorrow, and be a millionaire the next day by just asking for money. He could probably be a billionaire again in a decade if he tried.
Sorry but spending / donating money is not a difficult thing to do. If you have billions of dollars, claim to be donating much of it, but somehow your wealth continues to increase, perhaps you’re not trying hard enough?
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.
That doesn't make sense at all! What is this PR for? Are people buying more Windows Licenses because he is paying to charity? Are people sending money to him?
Is he making billions of dollars getting commission for books he recommend? What do you mean?