However there are also those people who want to trade Bitcoin, usually with leverage and usually with borrowed funds. Whether it’s from a credit card, loan, line of credit. Those are usually the ones which get liquidated at first. And we saw this back in late 2017 when people were opening up Coinbase accounts and funding with their credit cards. What that led to was visa and MasterCard blocking those transactions because if the market corrected they would be on the hook if it led to people defaulting.
Hence why it’s difficult to buy crypto these days with credit cards .
I don't think that Visa/Master took action back then because of a rise in the number of defaults from cryptocurrency users. From what I heard, the unclear legal status of Bitcoin was primarily responsible for this situation. Recently payment processors such as Visa has become very selective. They have refused to provide their services to merchants in certain sectors, such as cannabis stores, porn websites, online casinos.etc. The action taken against cryptocurrency users was not a one off measure.