World's most sophisticated hacker who happens to be in a jurisdiction who do not respond to provocations and operate out from behind the GFW illegally, and at the same time, never broke ranks even with the wealth and being in a remarkably well-resourced perch to defect.
The FBI and other federal agencies engaged in law enforcement routinely use appeals to authority and expertise they do not have and create set-piece situations that almost in every case involving more than one defendant sets up a circular firing squad situation where the most guilty is at an advantage of simply pleading guilty and cooperating first, or otherwise they'd dump it off via the AUSA down to the state level if they can, or blame China, Russia, NK, Iran, or Israel, countries that do not extradite their own citizens on request and rarely if ever do so unless it's done so on their terms. Blockchain tracing ultimately still needs the connection between the chain and off-chain ID and there's no surefire way to even ascertain with something that isn't a mere heuristic with an error rate unacceptable in criminal court and would fall apart if there's competent defense counsel, which the FBI have, in the one case where on-chain evidence was going to be used, actually went full Chewbacca and created a two year delay mid-trial and then pulled Chainanlysis' "expert" off before cross examination. The company has the balls to brag as if the courts have validated their method in whole, when in reality the court have long understood what clustering is and so that part is of course admissible evidence, but it also doesn't get you to the purported end - attribution. If one can use a strawman as a sales tactic, this would be exactly that. The attribution aspect have never been allowed to be properly examined in the criminal context. The "reactor" is merely a database, and in the small bit of direct examination the chainalysis employee claimed that every time he queried the database the correct rate was some absurd, Robert-Mugabe's-election-number figure that is higher than the DOJ's conviction rate when they were still credible and actually higher than the CCP's official conviction rate in a fake criminal justice system where due proceess doesn't exist and they give leeway because claiming to be 99% correct is absurd. Of course, they've never been tested in the same situation and still haven't, and if the industry mouthpiece is basically hiring sales and not legal, which is basically what every company in the Blockchain Association has been doing, rent-seeking to be Wall Street 2.0 on top of free merged pull requests and open source software. Tracing on chain is all well and good for shits and giggles but Department of Treasury went and sanctioned a smart contract thinking that it was an EOA address that belongs to a person as if etherscan was never checked beforehand tells you all you need to know.
They had a bad case against Tornado Cash since the ultimate demand would require the devs to somehow predict the actual identities of those that interact with their contracts - which in many cases isn't even a human. It's telling that when the 5th Circuit and the one judge in that circuit who knows anything about process and technology through sheer luck got on the panel and wrote a clear rebuke of how federal investigators failed at doing any due diligence, and for once, the feds did not attempt to do an end-run or even ask for en banc hearing of the issue, but simply made up a completely different issue to pursue (building the front end) which is not a crime. The feds can't match the IP/in house firms in renumeration and can't even match public interest or federal defenders in hiring out of tech competent law grads when it comes to having a moral high ground. They have so much resources so that they can hire contractors, but can't vet the contractors. Being able to fall back on coercion covers up a lot of incompetence. The Atomic Wallet 'hack' was almost certainly not a NK job as they have claimed, for example, and they relied on some dude on twitter's hunch (notably the first thing one learns that is never evidence if presented in court) and a post-hoc heuristic that is indistinguishable from a copycat or a third party's infrastructure to make the attribution. People with poorly thought out opinions are all over the place on Twitter, but this permission slip to "make mistakes". Also, they're part of the system of funding provided to your local police so they are better funded now than before 2020. Check their work under all circumstances, and plea bargains should not be considered as evidence of actual guilt since coercion and BS is as common as actual cases backed by properly collected evidence that builds a procedurally sound case.