Except it wasn't "taken", but licensed from CodeWeavers in a commercial partnership. This implies that they're contributing cash, not code.
CodeWeavers released an annoucement when Gaming Portal Toolkit was announced.
https://www.codeweavers.com/blog/mjohnson/2023/6/6/wine-come...
You sure there was any kind of commercial agreement? Doesn’t look like it.
On top of that, Apple's DX to Metal code is not re-distributable. So yes, this sounds like more of the same from Apple.