Credit where credit is due, I saw this idea in How to Get Past DMCA Take-Downs in Google Search and report it here, sans the video.
The gist of the idea is that DMCA complaints, found at: Lumen, specify in the case of search engines, links that should not be displayed to users.
In a Google search result, content subject to a DMCA complaint will appear as:
In response to multiple complaints we received under the US Digital Millennium Copyright Act, we have removed 2 results from this page. If you wish, you may read the DMCA complaints that caused the removals at LumenDatabase.org: Complaint, Complaint.
If you follow the complaint links, knowing Google is tracking your following of those links, the complaints list the URLs to be removed from search results.
You can use the listed URLs to verify the presence of illegal content, compile lists of sites with such content, etc.
Enjoy!
PS: I’m adding their RSS feed of new notices. You should too.