There's a key distinction here between what happened to Megaupload and what can happen under SOPA: The feds took a long time to gather the evidence they needed

There's a key distinction here between what happened to Megaupload and what can happen under SOPA: The feds took a long time to gather the evidence they needed for a warrant before they took Megaupload down. Under SOPA, all that would be needed is the accusation of copyright infringement alone. That's a pretty important distinction.