A method conceived in the research margins of AI security has migrated, as such methods tend to do, from the theoretical into the criminal. Spammers are now embedding invisible Unicode characters into phishing emails — characters imperceptible to human eyes yet disorienting to the AI filters trained to stand guard — with Microsoft documenting millions of such emails already in circulation. The episode reminds us that knowledge, once released into the world, does not wait for permission before finding its darker applications, and that every defense system carries within it the shape of its own