tl;dr: AI-enabled wearables (pins, pendants, glasses) that continuously record and transcribe conversations are becoming mainstream, prompting startups like Deveillance to develop countermeasures such as the Spectre I jammer. However, modern speech-recovery algorithms can strip away ultrasonic jamming and background noise, forcing researchers to explore alternatives like generating fake "anti-speech" or decoy audio. Given the massive investment behind speech-processing tech versus the small players building defenses—and the possibility of lip-reading or vibration-based recovery—privacy advocates warn this cat-and-mouse game heavily favors the surveillers.