Microsoft Copilot

Company-wide policy — not product-verified

microsoft.com

Company-wide policy, not product-verified — and the best available Copilot-specific source (Microsoft's privacy FAQ) states it covers "the older version" of the app, with no current replacement page that states enough to verify facts against.

Data Practices Disclosure

Trains on user data: Yes
Data retention: By default, conversation activity is stored for 18 months
GDPR mentioned: No
Reviewed by a human: Yes

Sources

https://support.microsoft.com/en-us/microsoft-copilot/privacy-faq-for-microsoft-copilot