They sell it for money. You will never hear about it. It may pass through a single person's hands. Remember the article on here that told about how all major cell providers are selling your location data through a two man mob-like operation?
"In order to provide this computing experience, we collect data about you, your device, and the way you use Windows. "
"We also share data with Microsoft-controlled affiliates and subsidiaries; with vendors working on our behalf; when required by law or to respond to legal process; to protect our customers; "
Obviously when they sell to data broker, they call them a vendor.
https://privacy.microsoft.com/en-us/privacystatement
"In order to provide this computing experience, we collect data about you, your device, and the way you use Windows. "
"We also share data with Microsoft-controlled affiliates and subsidiaries; with vendors working on our behalf; when required by law or to respond to legal process; to protect our customers; "
Obviously when they sell to data broker, they call them a vendor.