I think I may be able to clear up a bit of confusion here.
All (almost all?) of the code related to Arc so far has been released as open source by various authors, including rntz's extensive work with Anarki.
Thus when code hasn't been released, it's been because the author doesn't think it's good enough yet, instead of because the author wants to keep it proprietary.
So when one of us sees something cool, it's not uncommon for us to say, "oooh, we'd like to see the source to that!" Not as a request to give away something proprietary, but to say that if someone has code that they'll be making open source anyway, to encourage them to go ahead and release it, because it looks cool.