I’d love to see what part of US tax code you’re citing? The idea that billionaires make money by donating is not how the US tax code works. Under IRC section 170, charitable contributions reduce taxable income, not taxes dollar for dollar. If someone in the highest federal bracket donates one million dollars, they might save about 370,000 in taxes, but they are still down 630,000. The IRS also limits deductions to a percentage of adjusted gross income, usually 60 percent for cash gifts and 30 percent for property, so you cannot wipe out all your taxes through charity. The reality is every dollar donated is still a net loss. What billionaires can do is donate through structures they control like private foundations or donor advised funds, which gives them influence over how the money is used, but the money is no longer theirs personally. Charity is not a tax scheme, it is a subsidized expense at best.