To me it's the Spegel author's fault: there should be a copyright header in every single file, such that Microsoft would have to keep it.
If some of the peerd code was lifted from Spegel, it's blatant stealing. Code attribution is the only thing a MIT license asks people to honor, and Microsoft couldn't even do that.
From the authors reaction they chose the wrong license for the project.
Could we say "it's incorrect attribution"?
> and Microsoft couldn't even do that.
Did you consider it may have been done by an engineer who, in good faith, thought they were giving proper credit by adding it to the README? Would you want that engineer fired because of the bad attribution?
It's not like Microsoft is making millions out of this. Sure, they should fix the attribution. It's a mistake.
Most startups/small companies I've seen rely heavily on open source and fail to honour every single licence. This is bad and nobody cares. Here, Microsoft mentioned the project in the README (which is not enough, but not nothing), and I'm pretty sure that they can fix it if someone opens an issue. But overall, companies like Microsoft do honour licences a lot better than startups in my experience.
BigTech is evil for many reasons, but maybe we could consider that this is just an honest mistake.
But corporations hiding behind their workers is a no-go. Corporations get to enjoy their successes, and it's fair to hold them accountable for their failures. Least Microsoft can do is a bit of public comms work detailing what they will do to ensure these mistakes are not repeated in the future.
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.