Microsoft does credit the authors on their README. Maybe it's not exactly the right way to do it, but they do it.
Now if it's not the right way to do it, what about opening a PR and asking to change it? Instead of writing a blog post to complain about them?
Now maybe those engineers thought they did well, will get issues internally because of the bad publicity for Microsoft, and next time they want to use an open source project their legal department will be even more of a pain in the ass because if they aren't, then random people on the Internet use that to do bad publicity for the company.
Why not assuming that they are in good faith here? There are enough reasons to hate Microsoft other than this one.