I believe that they compensated people for putting up files as well. It's not impossible to have a case where you want the copies of your files put up by some

I believe that they compensated people for putting up files as well. It's not impossible to have a case where you want the copies of your files put up by some other uploader taken down without wanting your own removed. The fact that one copy was put up without permission does not necessarily mean they all were, though that's probably the case 99% of the time. Of course, depending on how you read the DMCA, they may have been obligated to do that anyhow. We'll have to see how it all plays out in court.