There's also printing dollars, I expect they've gotten good at that by this point. Last I read the US Treasury spends $1 printing a $100 bill, that's a huge am

There's also printing dollars, I expect they've gotten good at that by this point. Last I read the US Treasury spends $1 printing a $100 bill, that's a huge amount of seignorage. All counterfeiters have to do is print a close-enough bill at say $20 and they're making money.