Comment by linuxlewis

I think the best use-case is when you're chatting with someone and want to quickly send them something you wouldn't want to send unencrypted. A password or some image of a prototype. Instead of posting it to a public site and just waiting to delete the image, or text.

As for the domain, my goal was to keep it as short as possible. The root domain cret.ly works as well so I could just downplay the "se." to prevent confusion.