There are many reasons to distrust Microsoft. The wording of this particular paragraph explaining how data gets used in accordance with the linked terms of service (which are the actual governing documents, not the page you’ve linked to) is not one.
I agree that the particular wording is not sufficient to specify much of anything, but does it sure doesn't shut the door on the possibility either.
Unless you can meaningfully show that Microsoft is actively applying a subsidiary relationship (that is, where it directs OpenAI’s product direction), I have to disagree with your base notion.
At this point, I reiterate that your original claim is 100% FUD and disinformation.
I’m not asking you to trust GitHub or Microsoft, but legal terms have meaning and the terms do not support your assertions.
The top of the document is:
> GitHub aggregates metadata and parses content patterns for the purposes of delivering generalized insights within the product. It uses data from public repositories, and also uses metadata and aggregate data from private repositories when a repository's owner has chosen to share the data with GitHub by enabling the dependency graph. If you enable the dependency graph for a private repository, then GitHub will perform read-only analysis of that specific private repository.
> If you enable data use for a private repository, we will continue to treat your private data, source code, or trade secrets as confidential and private consistent with our Terms of Service. The information we learn only comes from aggregated data. For more information, see "Managing data use settings for your private repository."
Taking a single paragraph out of context isn’t worthy of the top-voted comment.