I disagree. It's more like buying $300,000 worth of <thing> but <thing> turned out to be used in money laundering. So when you used it for collateral, the ban

I disagree. It's more like buying $300,000 worth of <thing> but <thing> turned out to be used in money laundering. So when you used it for collateral, the bank decided to recall the loan. In this case <thing> is BTC, but it could very well be dollars whose serial numbers were recorded by the FBI say. But the bank probably wouldn't negate a loan in that case, since you may not have had knowledge you were dealing with a criminal. Multiple transactions with a criminal than, yes, you probably deserve whatever the bank does to you. It's subtle because it means that if you accept BTC as payment for legitimate services you've offered (e.g. Tesla), you may not be able to use it for the purposes you intended.