Mentioned explicitly by Schneier in his post: "And “ransomware couldn’t exist because criminals are blocked from using the conventional financial networks, and

Mentioned explicitly by Schneier in his post: "And “ransomware couldn’t exist because criminals are blocked from using the conventional financial networks, and cash payments aren’t feasible” does not count." I assume you picked your strongest objection, you need to say something about why blockchain is better than alternatives to make illegal transactions.