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It’s been used for ads for years.

• pavel_lishin 2y ago
  How so?
  • paulmd 2y ago
    https://en.wikipedia.org/wiki/Cross-device_tracking#Ultrasonic_tracking_2 https://en.wikipedia.org/wiki/Cross-device_tracking#Ultrason...
  • xphilter 2y ago
    I brought some class actions years ago alleging the unlawful use of this tech for essentially ads purposes: https://topclassactions.com/lawsuit-settlements/lawsuit-news/golden-state-warriors-seek-dismissal-app-spying-class-action-lawsuit/ https://topclassactions.com/lawsuit-settlements/lawsuit-news... and https://www.freeadvice.com/legal/lisnr-responds-to-lawsuit-that-accuses-app-of-eavesdropping-without-consent/ https://www.freeadvice.com/legal/lisnr-responds-to-lawsuit-t...
    • Etherlord87 2y ago
      1st link: claim dismissed. 2nd link doesn't work for me (access denied).