I believe that there was a change in technology that is causing Megauploads problems.
I think Megauploads was created to allow users to remote access or share access to files with a link. Upload the files or share the link and you are connected to the data that was uploaded. You could in theory upload something with a dummy account at a public hotspot, but someone would still have to share the link. Under this system, once the intended transaction takes place the uploader may take his stuff down. That is pretty inefficient as a piracy scheme goes - it is about the same as making audio tapes of music for your friends.
Now there are search engines that will rifle through the content on megauploads and allow anyone to access it. Since you can hide behind a dummy account at a public hotspot and upload to your hearts content, piracy is a problem. There is no longer a link between information and uploader. There is also no reason for the uploader to remove the material. (I am sure you could track someone down at a public hotspot, but exactly how much effort do you want to put into this?)
The staff who handles infringement are likely buried in complaints or perhaps there are a lack of complaints because copyright owners can't sift through all of the junk that get their name/label slapped on it erroneously.
Solfe
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'That was tops! Who's not good at math? I was all, "Four!"' - Finn, Adventure Time.