Privnote-messages that self destruct

Have you ever sent a message that you didn’t want to send from your own email or anything associated with you.
I know I have
Well a solution is here, Privnote- “send notes that will self destruct after being read”
Go to Privnote write a note, copy the link and email it to your recipient, your recipient clicks the link and gets below

Your recipient reads it, the note is destroyed, should anyone click the link again they get the below message

Hey what a cool idea
“Have you ever sent a message that you didn’t want to send from your own email or anything associated with you.
I know I have.”
LOL, the mind boggles…
Is this how Valleywag gets so many great scoops?
Google taught us that a destroyed message might be a flag in a database, so destroyed just becomes hidden.
Is that website trustable? Who guarantees me that data are really removed from their infrastructure?
Who’s going to stop people from simply printing out the message?
Have a look at their privacy policy:
https://privnote.com/privacy/
This message from Privnote’s creator also answers some of your questions:
http://groups.google.com/group/privnote-tech/browse_thread/thread/ed8c393872c261f