I had been copied 6 times (24 sets in all) and it's never a good feeling. This group started out like a sort of communication group. Get the word out on a copied set and help each other out.
Truth is, it happens regardless of a group specializing in it.
So, this group simply supports the Original Campaign.
You'll often see on profiles this disclaimer: I support the campaign "BE ORIGINAL" . Do not copy sets of other members (copy this message in your page to support this campaign!)
Well, I decided to do that with this group.
Also, very important to read or pass on → https://polyvore.zendesk.com/entries/20927627-Community-Guidelines-
They also have very good answers to some questions, such as if someone has liked many of your items (like 50+), it's not stealing. The items belong to everyone. If someone has used the same items in a set, but placed them differently, the chances are very likely that it isn't considered copying. Polyvore states "if someone has copied your set in its entirety", meaning the copied set is an identical copy, then you have copying issue.
Hope this helps!