https://arstechnica.com/gadgets/2017/09/windows-10-fall-creators-update-shaking-up-privacy-settings-some-more/

Microsoft is continuing to tinker with the privacy configuration and options in Windows 10, with the Fall Creators Update, due for release on October 17, including yet more changes to the privacy controls above and beyond those made in the previous update.

The biggest change surrounds not Windows itself, but third-party applications. Similar to applications on mobile platforms, Windows Store applications require permission to access things that might have privacy sensitivity—the camera, microphone, calendar, contacts, and so on. Currently, that permission has been provided implicitly; except for access to location information, which requires an explicit user grant, applications get access to these sensitive things by default. Access can be revoked after the fact, from the Privacy section of the Settings app, so users still have control, but the model is one of opting out of giving applications access, rather than opting in.