You don't understand my point (probably my mistake).
If the file starts with:
// <MIT header>
// Copyright evantbyrne
Then a fork should read:
// <MIT header>
// Copyright evantbyrne
// Copyright Microsoft
But if you did not add "// Copyright evantbyrne", the MIT license doesn't say that Microsoft should add it. I don't even know if it's legal for Microsoft to do it. You have to add your own copyright to the files where you own a copyright.
Right. So they should just copy this licence somewhere in a subfolder, saying "parts of this project derive from Spegel, with licence: <copy of the licence>"?
They can still do it now, and probably they should (someone can even open a PR?).
