the Silk Road server, even though operating in a foreign jurisdiction, was infiltrated then seized by US Federal law enforcement.
The operator of Megaupload might also beg to differ with you.
The problem with your Silk Road server assumption is that it was NOT in a foregin jurisdiction. It was in fact hosted within the United States of Fascism.
That's not correct.
In particular, the FBI has located in a certain
foreign country the server used to host Silk Road's website (the
"Silk Road Web Server"). Pursuant to a Mutual Legal Assistance
Treaty request, an image of the Silk Road Web Server was made on
or about July 23, 2013, and produced thereafter to the FBI.
There was backup server in the US though at JTAN which was revealed mid february.