But do you really consider seizing his assets and shutting down his service well before court rules on anything to be "due process"?
The closest physical-world equivalent to Megaupload is a fence - not doing any stealing himself, but a knowing part of the process.
Would the police seize the goods of the fence and close his shop? Yes, they would.
Would they close it even if he runs a newspaper shop as a front? Yes, they would.
Would it suck for the honest and probably unknowning customers of his legal shop? Yepp.
And still, that's how the system works. It's not perfect, I have plenty of stories to tell myself where it fails or falls short. But frankly, I'll take this one over any out of Africa or most of the rest of the world.
So what about due process? Why does it work like this?
Because there are the rights of the accused on the one hand, and then there are the rights of the victims on the other. "Innocent until proven guilty" does not mean what you think it does. Otherwise he wouldn't be in jail, for example. The fence isn't exactly free to continue fencing until the court case has run its course. If the government busts an illegal business, it gets shut down. Because the accused isn't the only person in the world having rights. The rest of society has rights, too. Not having to put up with criminal activities is one of them.