While I agree, having access to the source of your build tool can be invaluable for debugging odd issues. So while no one will ever want to fork this they may use it as reference and/or for debugging.
I definitely look forward to being able to check the source for all the things with zero meaningful documentation beyond a few old blog posts and a book.
Yeah, I've never written anything in .NET but I know from experience the pain of sub-par documentation. Thankfully most of the stuff that I work with is OS so I can always dig into the code if the docs are lacking. Glad that now .NET devs who use this can do the same!