File-sharing in such form may not be anonymous, for example one may keep a snapshot of what's on that disk, and then check again after somebody have used it. Th

File-sharing in such form may not be anonymous, for example one may keep a snapshot of what's on that disk, and then check again after somebody have used it. That could catch anyone wet-handed for sharing anything, albeit legal or illegal. The anonymity is not as easy to preserve as it sounds like. Likewise some may put virus into the disk (internally or automatically due to the virus itself) which the next person may not have their computers patched and have no anti-virus installed.