This is an algorithmically enforced one, though.

But anyone can screenshot the message or take a photo of it. The point is that it's not actually enforced.

Anyone can screenshot or take a photo of any decrypted message. The question is when the email leaves Google's servers and whether you can trust Google with that same document.

Personally, if I had a message where I would consider a tool like this, I would just encrypt it on the client with PGP or something.

> Anyone can screenshot or take a photo of any decrypted message.

Yes, but ordinary decrypted messages don't claim to have superpowers like self-destructing.

The person I replied to wrote that this was "algorithmically enforced". I'm just pointing out that this is incorrect.

As long as it doesn't leave Gmail.