Issue is if he's paying himself with the charity's money he'd have to pay tax on that, and if he wrote that off with a donation and paid himself again then it'd reset the loop - there's no loophole there, literally, as it'd be an endless closed loop of transferring money.

Given the best interests of the US government are destabilising other countries and supporting unfair healthcare companies, and given what is known about Bill Gates' charity spending I think a higher proportion actually goes to the betterment of society than would if it went to the US government