A prepaid card isn't "self-hosted". They're just front end for a bank account that can be closed or restricted by external forces. The right people in law enf

A prepaid card isn't "self-hosted". They're just front end for a bank account that can be closed or restricted by external forces. The right people in law enforcement could probably make a few calls and shut down an arbitrary prepaid card (or group of them). There's also a strong paper trail that can be used for that-- they could reasonably say "any card that was used at this suspicious merchant should be shut down". They can't demonetize a few random $100 notes with anywhere near the same degree of ease or specificity. Nor does the logging infrastructure exist to find every note which touched a suspicious individual.