There are many ways for people to "Exchange" data online, and Limewire has been plagued for years by viruses and pornography that in many instances was put there by people hired by the media companies to discredit it as a dependable source for music and movies.
They will never completely put an end to sharing of any kind, in the old days we would borrow each others albums and make cassette copies, if we liked the album enough eventually we would buy our own copy.
The scale of this phenomenon is beyond the capability of the authorities to handle in a legal way, scare tactics, bullying ISP providers, political rhetoric will be the standard operating procedure.
Until they stop the outright counterfeiting going on in Asia all this is small potatoes anyway.