Run these commands to check current telemetry settings:

The crux of the privacy debate in Windows 8.1 centered on the post-installation "Express Settings" screen. This is where the operating system’s features became a conduit for data collection.

Windows 8.1 and Windows Server 2012 R2 privacy statement outlines the data collection and usage practices for features encountered during installation and initial setup. It distinguishes between automated processes, like activation, and features where users can make specific configuration choices. Key Installation Features and Decisions

If you must run these OSes in a privacy-sensitive environment (e.g., healthcare, legal, government):