In terms of the information on our devices that support Siri, there is a part of the device that is constantly listening. On some of our devices we've isolated it beyond even iOS, beyond our operating system, into a dedicated coprocessor, basically a specialized piece of hardware, which is not recording or storing that information but is listening only for the wake-up word to trigger our personal assistant, so that information isn't retained on the device.
Further to the point of your question, it isn't being collected into any sort of derived profile to identify something about the users' behaviour or interests. No.