Apple has announced in a statement that it is suspending the program which resulted in human Apple contractors listening and grading a selection of Siri responses for quality control.
The company conducts a thorough internal review of the Siri policies, will reintroduce (probably another form of) Siri rating when completed. When Siri rating returns, users will be able to opt out of rating.
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The company decision follows a Guardian report that shed light on the type of calls Apple contractors heard on a daily basis, as a result of the Siri grading program.
Many of these audio recordings were made when users did not even realize it was happening, as cases where Siri thought it heard someone say "Hi Siri" trigger the phrase, but it was wrong. This mainly means that random audio excerpts from people's lives were retained and listened to by Apple teams.
Apple's small print privacy did not explicitly mention that people can listen to Siri audio samples, a company outlier that tries to limit data collection and be explicit and open about how they used it.
As it stands today, there was no way to prevent you from sending your sound samples to Siri for possible "grading" – other than turning Siri off completely. Other services give the user control over whether they want to share data with Apple to improve the service, such as the "Improve map" option.
Apple's statement today addressed this, saying that users will be able to choose whether to participate in grading as part of a future software update.
Apple did not say how long it expects Siri policy review to take.