https://arstechnica.com/gadgets/2019/07/siri-records-fights-doctors-appointments-and-sex-and-contractors-hear-it/?amp=1
I suppose that anything's possible. Who wants to fund a research study and hire test subjects to try to make "Hey Siri" sound like a zipper? Does the world need the results of a study like that before concrete steps are taken to protect people's privacy?
