Idea: A plausible deniability expiring chat

But what about if one goes completely the other way and tries to make it so easy to fake messages that no one can be sure the screen shot published, is actually authentic?

Summary: Make a chat app with built in tools for editing received messages and taking screen shots of the edited versions, and make sure these tools are very easy to use.

In that way any screen shot from the app will be accused of being faked and edited, and there is no way of knowing if it was indeed the original chat message received. This gives plausible deniability to the person sending the chat message. Instead of  expiring the chat message, one is expiring the trust in the screen shot being original.

There are a number of chat applications that try to preserve the secrecy of messages by expiring them at the receiver's end after a short amount of time. However, one can of course always make a screen shot on the receiving end and preserve it forever, and then present it at a later inconvenient time for the sender.

But what about if one goes completely the other way and tries to make it so easy to screenshot and also fake messages that no one can be sure the screen shot published, is actually authentic?

That could be an interesting chat app, although it of course could be severely misused as well.