They should have used Monero. It's also why I feel privacy coins are ultimately a bad idea.

I'm biased, but I couldn't agree more that if you think about it, this is a strength of bitcoin and not a weakness. They wouldn't have been able to crack it without using blockchain explorers.

Also, cash is still used to buy and sell all the most messed up stuff in the world. The majority of illegal stuff are bought using money. Crypto just makes international and cyber crimes easier because it's decentralized.