Kim Dotcom's company has been likened to a murderous, cocaine-dealing rebel army.
At the federal court in Alexandria, Virginia, the US authorities also argued a case to freeze Megaupload's assets forever.
Dotcom's lawyer said it was clear American prosecutors watched too many action movies.
Judge Liam O'Grady did not issue a ruling after the hearing but said he would send out a written decision in "days, rather than weeks".
Dotcom's US lawyer Ira P Rothken said the comparison with the Revolutionary Armed Forces of Colombia was a last-minute stunt.