Infringing Forks?
"Now, it's fair to say all or most copies of the copyright-infringing material will also be infringing. We can't imagine someone forking the stolen iBoot blueprints, and then taking out all the Apple-eyes-only code – there wouldn't be much left, except maybe the source comments."
Even if you did this, I would have thought the fork would almost certainly still be infringing because the original code would still be contained in the git history. Sure, it's possible you could get rid of this via some git gymnastics, but in that case it would seem a bit weird to have created a fork in the first place - you'd have been better just downloading the code, removing anything infringing, and then publishing it rather than forking.
Biting the hand that feeds IT
