I just remembered a story.

If you think about Chipmixer with his paypal account, Binance, etc...
The same thing happened to Bitcoinfog to arrest the operator. He used Lyberty Reserve, a MtGox account with his real identity, etc.
Bought hosting server with LR and BTC coming from MtGox.

(Old people surely remember about Liberty Reserve?)


It doesn't really matter. The fact is they consider CM as a money transmitter under the Bank Secrecy Act and he hasn't registered with FinCen and so hasn't maintained an anti-money laundering and KYC compliance program. If he did, he would have knew the origins of the transactions

Chipmixer: "I didn't know the origins"
The USA: "You didn't know because you didn't follow the laws"

(but good comparison with a war)


If you seize a server, you have no choice to have data of something. And if you're a law enforcement why should you refuse to collect data...
Unless you don't want to do your job...