It's a pretext for hiding what content is allowable for download to protect them from liability.

I expect it will be with the authorities breathing so hard down their necks, and the questionable legality of the files users will likely upload.

>Unfortunately, we can't work with hosting companies based in the United States. Safe harbour for service providers via the Digital Millennium Copyright Act has been undermined by the Department of Justice with its novel criminal prosecution of Megaupload. It is not safe for cloud storage sites or any business allowing user-generated content to be hosted on servers in the United States or on domains like .com / .net. The US government is frequently seizing domains without offering service providers a hearing or due process.