I don't get it. From the first lot of replies the OP received to his question, it is quite clear that most, if not all, would agree that working for free is not a very good idea.
Why then, is this discussion continuing?
FWIW, I would not acknowlege, or even speak to anyone who ever admitted to having done so!
But maybe that's just me; A cranky old bastard!
Taily; You wanna make with the padlock?