Spreading disinformation in 2019 is despicable itself.
- Microsoft already handles data from competitors in other portions of their corporation. If it was discovered that Microsoft and / or GitHub actors were acting in bad faith with private repositories, that would immediately erode the trust of their Azure platform.
- Most projects are more than just the code. It's often build toolchains, pipelines, and other specific knowledge around said code.
Code is cool, but they could already know everything every company in the world is doing.
I don't think they're abusing the trust put into them, we'd know by now.
They'd also probably be blown to smithereens by governments and other corporations, through lawsuits.