FluffyApp is just a 3rd party program that links to CloudApps website(Which is free for anyone to use, but officially their program is Mac Only).
CloudApp is like the public folder on dropbox. It's very useful when you want to share something quickly, such as a screenshot, document, bookmark, picture, rar file, ect.
It's not a cheap way of ctrl c -v. Unless they made it that ctrl c uploads to a web server and automatically copys the link to your clipboard. Highly doubtful, though.