According to an analysis by the Electronic Frontier Foundation (EFF), even users who opted out of Cortana were subject to an “unprecedented” amount of information capture, including text, voice, and touch input; web tracking; and telemetry data on their general use, programs, session duration, and more. The EFF also found that the company chose to hold security functions hostage to personal data flows, claiming that security updates for the operating system would not function properly if users chose to limit location reporting.

Shoshana Zuboff, The Age of Surveillance Cap…, loc. 515