Can someone explain simply why it is supposed to be so hard to track ransomware bitcoin payments, if all bitcoin transactions are in a shared public ledger? If the victim pays someone we know which account it goes to, right? Then we know that account is criminal. If bitcoins move from that account to other accounts we know that accounts that receive them are essentially "hiding stolen goods". So they are criminal acc…
I think you are correct about getting dollars out being the risky part, but this way the criminals will at least have a head start in their race against the FBI.