This post covers stablecoins, but has some good points on btc and usd. It's also from September and the numbers are much larger now.
https://www.coindesk.com/crypto-dollar-surge-opportunity
"Today, the U.S. is still the center of gravity as far as bitcoin and the crypto-dollar ecosystem are concerned. This is a significant advantage that should not be squandered. Policymakers should be thanking their lucky stars that a putative successor to the U.S’ financial infrastructure is a largely American phenomenon. The U.S. can continue to muddle down an increasingly exclusionary path and punish subscribers to its financial infrastructure by burdening them with political dictates, or it can embrace a neutral alternative. Self-disruption would be a significant bullet to bite, but it suits the U.S. Values like liberty, privacy, free enterprise and personal autonomy are embedded into our Constitution and social fabric. One can hardly think of a better nation to underwrite a shift to a truly neutral payments and settlement infrastructure."