Cortana wants to know you else she won't talk to you. The Windows 10 privacy controversy is putting the focus on cloud based assistants.
Windows 10 is out since a week. Besides overriding the default browser settings, there is one big Windows 10 controversy about privacy. Windows 10 is spying on you say several reports and they are right. Some privacy issues are around advertising, but the bulk is about Cortana, the digital assistant in Windows 10.
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Cortana only works if "Getting to know you is turned on." That says it all. Microsoft provides these details: "When you interact with your Windows device by speaking, writing (handwriting), or typing, Microsoft collects speech, inking, and typing information—including information about your Calendar and People (also known as contacts)—that helps personalize your experience. This information improves your device’s ability to correctly recognize your input, such as your pronunciation and handwriting. You can turn the Speech, inking, and typing setting (which is called Getting to know you) on or off in Settings."
Cortana lives in the cloud and everything she knows about you is also stored there. The "cloud" are computers at Microsoft data centers. If you do not want Microsoft to have all your private data you cannot make use of Cortana.
Apple fans can be a bit less concerned with Siri. Apple makes a point to process user data locally and not transmit it to the cloud. If that remains a feasible strategy remains to be seen. Google Now is transmitting personal information to the cloud.
Digital assistants are only useful if they know as much as possible about the user. This is the same as in the real world. Donna is the super assistant only because she knows everything about Harvey Specter in the TV show Suits.
If you are not planing to use Cortana it is best to switch Get to know me off. Mind you that this means also dictation will not work. Go to Start, then Settings > Privacy > Speech, inking, & typing, and then select Get to know me to turn the services on, or select Stop getting to know me to turn the services off.
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While you are at it you should also review the privacy settings and switch off everything you are not comfortable with.