The article discusses the potential risks and opportunities of motion tracking data in extended reality (XR) and the metaverse. While this data is often presumed to be innocuous, recent studies have shown that it has the potential to profile and deanonymize XR users, posing a significant threat to security and privacy in the metaverse. The article highlights the need for increased awareness and caution regarding the collection and use of motion data in XR and metaverse experiences. https://arxiv.org/abs/2306.06459