With br3f you can create disguised and disposable redirect links. Use it whenever you have to share a sensitive URL in a chat or email.
Why would I trust "br3f" with "sensitive URL"? Why would it be accessible by anyone or from anywhere to begin with? And most importantly, why would I put it in email which is literally the least secure form of communication?
Agree on the email part. Obviously you don't want sensitive information inside emails. But with br3f you have additional security, since a link can only ever be accessed once.