Especially since they are not given any information about from where the recording came, or by whom it was recorded.
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Since the recordings were anonymized no ones privacy was violated. One of the jobs I had before I retired involved creating anonymized data sets of the patients the organization treated for statistical analysis. All within the HIPPA privacy regulations. And, no, he patients were never told or asked for their permission.
People sometimes use personal information when using assistants that you can decipher who a person is or where they are from. You think Apple shut down this department and put this activity on hold for no reason?
There are clear privacy concerns here. I for one am fully aware and use google products knowing they use my data but Apple goes to great lengths promoting privacy, what happens on your phone stays on your phone which is a lie. For me the issue is more about not being forth coming and selling people on marketing ads that to me promote complete privacy which is obviously false.