Microsoft serves ads though. I haven't looked through the terms and conditions, but I'd be amazed if it wasn't permitted for GitHub to give whatever they can glean from your data to their corporate overlord.
> Affiliates: Personal Data may be shared with GitHub affiliates, including Microsoft, to facilitate customer service, marketing and advertising, order fulfillment, billing, technical support, and legal and compliance obligations. Our affiliates may only use the Personal Data in a manner consistent with this Privacy Statement.
