[Disclosure: I work for a large PLCC (Private Label Credit Card) company on the side, this is like an amateur level mistake, their risk office obviously didn't talk to legal about the potential compliance issues]
I'm honestly kind of amazed Chase allowed a credit card to be used for a cryptocurrency transaction. AFAIK, CapitalOne, Wells-Fargo, USAA, Comenity/Comenity Capital's co-brand cards, Synchrony's co-brand cards, and AMEX won't allow their cards to be used for it. CapitalOne has no problem with you using a checking account they run for it, same with USAA and Wells-Fargo, but your credit card will decline (debit still works though), and one of the reasons is because there's no clear regulation as to whether its cash and can be included in cash advances at the higher rates, a foreign currency subject to foreign transaction/conversion fees, an asset like a stock, a service, or a good. And its kind of all of the above, at least in regard to BitCoin due to its fairly high value and its utility.
They're in some shit in regard to CARD act compliance though because they can't change rates on a credit card product without giving 45 days notice by mail and by email if the bank so chooses, but it HAS to be mailed as well as a right to rescind (closing the account with no penalty) for 25 days after a rate change affects a consumer.
CARD and FACT Act compliance isn't just a suggestion either, the FTC and CFPB will nail your ass to the floorboards if you aren't in compliance, and the State of New York will likely sue you also, and the FDIC takes a very dim view of a bank that isn't complying with the law in any of their programs, whether its a regular bank account, an investment vehicle, or a credit card. Dumb thing for a company that usually knows what they're doing in regard to their credit cards, I've never had an issue with them personally. I'd never do retail banking through them (or with anybody but USAA honestly) because they're right up there with BofA and Wells-Fargo with their fees, but I've had a credit card through Chase for almost 15 years now and they and CapitalOne are usually really good about compliance.