[jaidhyani]

Going to be extremely hard to quantify, ransomware peddlers aren't famous for their meticulous public record-keeping. You could try to sift through all the transactions on the public blockchain and try to classify the ransomware ones, but that's going to be challenging at best I imagine.

Overall I'm skeptical of the claim. It could be true, or partially true, but demonstrating that would probably require some work. Alternatively, someone could demonstrate that liquidity came from speculators or some other source, which seems potentially less doable but still not easy.