Well, she could downsize to a mere 1% of her net worth and then spend the next 25 years spending 50K per day and still have over 100mil leftover for her old age

Well, she could downsize to a mere 1% of her net worth and then spend the next 25 years spending 50K per day and still have over 100mil leftover for her old age and the kids inheritance. And that's assuming zero further income. So there comes a stage where I am not about to pat any billionaire on the back for "a big donation". It might just be good PR and likely will be some kind of tax benefit too. That said, I'd rather see more of it than less because I don't think any single person is honestly so valuable to society to be worth that much. They honestly shouldn't have that kind of money. The system is broken.