Before it gets mentioned here is a good post why ransomware gangs love (traceable) Bitcoin. Most of ransomware gangs are more or less well known, not really anonymous.
http://jpkoning.blogspot.com/2021/06/why-do-ransomware-gangs...
http://jpkoning.blogspot.com/2021/06/why-do-ransomware-gangs...
This would set up an interesting experiment. Would you accept a $20 dollar bill in the supermarket if you knew it was used in some ransom case? And what if suddenly you knew you owned such a $20 dollar bill? Would you try to get rid of it as quickly as possible?
What would you set as a threshold?