In a statement, Apple emphasized that it has more privacy protection. The recordings are not related to Apple IDs, and they are being studied in "secure facilities" by people bound by "strict confidentiality requirements." It will not know who the device has requested or otherwise made connections.
It still gives some concerns, and not just the sensitive information itself. It is allegedly a "high turnover" for entrepreneurs, according to the source, and it is probably relatively low employment for new hires. A malicious recruitment can theoretically abuse the data. Nor does it appear to be guidelines for handling sensitive recordings. The staff is encouraged to report random "hi Siri" requests as technical issues, but not the actual content.
It would be difficult to avoid these recordings as long as Apple and the rivals want people to check the quality of voice assist requests. Hotwords like "hi Siri" and "Alexa" are not foolproof. However, the companies have not readily informed the public about their human QA team. And where Amazon and Google allow you to opt out of some uses for recordings, Siri tends to be an all-or-nothing affair. You can disable "hi Siri" or turn off Siri altogether, but there is no way to control what you share. This does not mean that you have a serious risk of privacy violation just by using Siri ̵