I think you are not aware of the business model of MegaUpload.
1. John uploads a file and distributes the link.
2. Jane wants to download the file. She can do it freely (low speed, daily limits) or for a little fee (fast download, no limits).
3. Jane wants to download many files, so she signs up for a premium account.
4. John gets a comission from MegaUpload.
What happens if John uploads copyrighted material and drives sales for MegaUpload using pirated software and movies? Well...the file gets removed, but nothing else. He can continue doing it again and again, even uploading the same file again.
And this was going on on a massive scale, hundreds of people were earning several thousand dollars per month from this and -- according to court documents -- Kim was very much aware of this and even actively encouraged uploaders to supply copyrighted material to the system.