This is a touchy one for me from 2 points- 1- as a sewer who may happen to use a piece and not realize it.
2- as an artist who has had designs copied and someone else taking rights to them. My grandfather was an inventor who had pattens stolen from him by simple drawing changes like by only flipping the layout on the drawing and resubmitting it and the patten then given to the scoundral who did it. Isaac Singer was notorious for such underhanded tricks.
Really the issue is not applicable to the crafter it's to the retailer who may be using this material in commerial production for which the designer must be notified and compensated-just like music is copyrighted and rights have to honored. With the theft of original work and cheap reproductions this is no surprise nor is it new, just simply has finally hit the salvage markings- it's nothing to sweat over.