That's a bit of rhetorical question - it shouldn't be (right)? But, if you read the description:
P2P / File Sharing: Sites that facilitate the sharing of digital files between individuals, especially via peer-to-peer software, including torrent sites
then, even though it isn't a "torrent site", it does fit the definition as it "facilitates the sharing of digital files".
This category is of little use if it includes sites like Dropbox. I'm bringing this up because, even though Dropbox has not (yet) been tagged as P2P / File Sharing, the cloud service I actually use, UbuntuOne (one.ubuntu.com), was recently tagged as such. I'm not happy; my sync got stuck for weeks until I discovered OpenDNS was blocking it.
Can we tighten up this definition a bit? Perhaps say the "public" sharing of files. As long as they're only shared with specific authenticated users (as Dropbox, UbuntuOne and other cloud storage services usually do), there's not a big risk of copyright exposure. These sites are already in the File Storage category, or should be; they don't belong in P2P which, in my view, should be limited to sites where copyright infringement is easy to do.
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