The Hacker News discussion revolves around Xfinity's new "WiFi Motion" feature, which uses WiFi signals to detect movement in a home. Users are concerned about the privacy implications, especially the potential for ISPs to share this data with law enforcement or third parties. Many argue for legal protections against such surveillance, advocating for a digital bill of rights. However, others believe technical solutions, like using your own router and VPNs, are more reliable. Concerns are raised that even if the feature is opt-in now, it could become mandatory later. The discussion also delves into the technical aspects of WiFi sensing, with some questioning its accuracy and others highlighting its potential for sophisticated tracking, even detecting heart rate and breathing. Some suggest countermeasures like signal scrambling or Faraday cages. The discussion also covers the EU cookie laws and the amount of consent given to using cookies for tracking. The conversation highlights the tension between convenience, technological advancement, and the erosion of privacy.