Not only is it a serious proposal, it's been used in practice in every airport X-ray baggage scanner for decades, where it's called Threat Image Projection (TIP): https://www.xscann.com/products-HiTipPlus.html and it's actually a regulatory requirement in that context in a number of countries: https://caainternational.com/course/threat-image-projection-...

Enterprises do the exact same thing today by sending phishing emails to their own people to figure out who needs additional training. Why would an enterprise not want this feature for Claude? It seems like an extremely serious proposal.