All the comparisons to Dropbox, Copy.com, etc are a little off the mark. Those are file syncing services (for keeping one's files synced across multiple devices) and CAN be used for sharing. Cloudup (according to the description on their site at https://cloudup.com/faq) is for streaming (not syncing) media and other types of files to anyone. So, while there may be a little overlap in functionality these are different kinds of services.