It says they took measures to not get caught. How did they end up getting caught?
Discussion
This one seems to go in more detail
😯
Apparently the IRS has a crypto unit. Interesting.
It doesn't exactly say how they were able to catch them. It says they tried to anonymize themselves but apparently there was a fatal flaw somewhere.
Which was obviously good in this case because these guys were bad. But if the government turns bad, I'd want bulletproof anonymity. I wouldn't want the government to be able to associate me with a Bitcoin address.