I occasionally do copyright searches for owners of images (it's a thing in online groups where "do not post images without permission" is a thing) pinterest is

I occasionally do copyright searches for owners of images (it's a thing in online groups where "do not post images without permission" is a thing) pinterest is full black hat when it comes to image ownership. It owns nothing it has on its site and without an account, there's no way to trace ownership using its links. And usually there's so many duplicates of the same images (without credit) that it swamps all search results.