Well on one hand it's clearly infringement...and posting it at all with the quotation:
"Downloading copyrighted material through torrents may be illegal in your country. Use at your own risk... Best of all, it's free!"
Sorta sends a mixed message.
Its one of the conceits of many of today's tech companies...creating something that allows for clear infringement/stealing and then trying to wrap yourself up in safe harbor by using language that says, hey...we don't have anything to do with what other people do...we're just a service.
This type of stuff annoys me about the tech industry...instead of building things that are not only useful but transformative, we have all these people building things that clearly are intended to skirt the spirit of the law by claiming they don't break the law, but if you use this you might be breaking the law. It sends a message to a lot of people this is okay and it makes it harder to convince media companies that we aren't all thieves that deserve even harsher laws to protect themselves from infringement.