I recently discovered a very bad Link from a bad PBN-Blog linking multiple times to my page and linking my pictures. Stuffed with keywords and so on, perhaps you know these kind of sites. The Blog also links to some other (big) concurrents in that very niche. I submitted the url to google, asking for deleting it and I hope my serps are gonna get better again now in a few days. But I'd love to find out, which one of my concurrents is using these bad domains to kill other ones serps. Of course it has Who-Is privacy. Does anyone of you guys have an idea for me, how I could get revenge or at least get the bad site de-indexed?