It's quite common to 'inadvertently' rip .... by hosting skins for others to dl....simply because you/they don't understand the mechanics of how sites such as Wincustomize, Devart, etc operate.
We have our content provided BY the artist.
Many 'private' sites simply DL the works from us and elsewhere and host them directly....without so much as consulting us [the host] or the skinner [the copyright owner].
Whether commercial content or not.....or correctly 'credited' or not .... it's copyright theft via unauthorised distribution.
I'll pen a request shortly.....tho it's currently 1.38 am, Monday here...so maybe on the morrow...