If you could move or process large files though a third party without having to physically download the file to a temporary location, it would be awesome... but apparently Dropbox doesn't think so. I deemed my project DOA because I had a feeling that what happend to Boxopus would happen to me across multiple platforms that I wanted to integrate.
instead of torrent -> local dropbox -> cloud dropbox,
you get only use your bandwidth for cloud dropbox -> local dropbox.
Given that many residential ISPs that meter data service don't differentiate between uploaded vs. downloaded data, that's a potentially valuable way to externalize the bandwidth requirements for your torrent (of undoubtedly legal/paid or public domain content, I'm sure)...