We don't know for sure, we only know that banks are not lending against crypto, for obvious reasons. What folks are putting on their credit cards, etc, well that is impossible to really track, but shouldn't be any different than retail sales, etc.
At any rate, the value of cryptocurrency market isn't a reflection of the amount of money that has been poured into it. The market cap is a product of the last price paid on any given exchange times the circulating supply of currency. So a $500B market cap might be the result of less than $50B worth of cash infusion, so long as the last person who bought in paid $13K for a Bitcoin.