You didn't do anything wrong, there is someone threatening to re-post the womens pics on f/b and I have pulled one of my slaves off here, advised another to be careful and warned a third who guards her privacy about it too.
You also have to remember that women have more to lose when it comes to putting out nude pictures than men. For a lot of men, if the pictures come out as they get older it is likely to be seen as an act of bravado or stupidness or youthful high spirits, for women it is more likely to have a dulling effect on their lives.
That may be so but BTO clearly said in his first post it was pictures without face on it which allowed the participant to keep her anonymity.
So I don't see what's the problem actually.
In my opinion it seemed like an interesting challenge. Too bad I'm too late and congratulations on the winner ^^!