The View Once media messages are technically the same as regular media messages, only with the "view once" flag set. All that is required for attackers to circumvent it is merely to set this flag to false, and the media become regular and can be downloaded, forwarded and shared.
Three years ago, WhatsApp introduced View Once mode, which allows messages to be sent, looked at, and then deleted without the recipient being able to save a screenshot of the message. It's not a perfect system; the recipient can use another camera to take a picture, but it wasn't bad either, and it would stem privacy violations.
People can save and copy the image, which invalidates the purpose of the feature. It's privacy theater. It's a sloppy design, designed in a very bad way. The design of the whole thing is a dumpster fire.
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