Github is barely at $200M in revenue and requires a lot of moving pieces to make that happen - something that just doesnt make sense for the scale of Google. It's not really a great business opportunity.
However, Google Cloud Platform does have private repositories that can also be used in their CI/CD solution.
However, Google Cloud Platform does have private repositories that can also be used in their CI/CD solution.
https://cloud.google.com/source-repositories/docs/