I know you’ve read all the headlines, but the answer is obvious. Do humans listen to your conversations with or without Siri? ‘No.’ Rene Ritchie found Apple’s view online:
Apple’s Siri also has human helpers, who work to gauge whether the digital assistant’s interpretation of requests lines up with what the person said. The recordings they review lack personally identifiable information and are stored for six months tied to a random identifier, according to an Apple security white paper. After that, the data is stripped of its random identification information but may be stored for longer periods to improve Siri’s voice recognition.
Much ado over not much.