Most of those physical dollars are overseas and most of the those overseas are $100 bills. With the US Dollar you can walk in to any bank or ATM and withdraw the "virtual" US Dollar and hold it, where the cryptos only exist in the system. I like all the forms of money, but I would rather see the paper and the digits backed by physical metals that could be redeemed by the bearer and if that happens there will be less generational poor people.