Apple has said, "We are obliged to give better Siri experience to the people, besides protecting the privacy of the user. We have suspended Siri grading globally. Apple has decided to stop recording the series for a while. Some time ago there came a report that some people are listening to the Siri Conversation of Apple's third party contractor.
However, the argument was that they are heard for quality control. Apple has said that this program is being suspended worldwide. The company was preparing to release a software update that would give users this option, so that they can opt out of the Siri grading program. As a future software update, users will get the option to participate or not.