"It's very useful for large files." Double edged sword like all technology. If these folks are advertising that they're actually hosting some of the files and it's illegal in Sweden... Of course, how much does it cost to hire a Swedish lawyer and pursue an international lawsuit? If you've notified the biggest companies involved and they don't/can't do anything then I'd say your chances are nil.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken