User blog comment:EmpyrealInvective/Petition against Plagiarism/@comment-4715955-20160517015633

"Thank you very much for giving us such a detailed suggestion and to all those who supported. I won’t speak too much to the first couple of ideas, as our policies are already zero-tolerance and there are filters in place to detect the copyright of already-published material.

As for allowing third parties to report infringement, however, this is something that we unfortunately cannot grant. When you submit a DMCA, you are submitting a legal request. The law specifically requires the rights holder or someone else legally authorized on their behalf to invoke such a request; 3rd parties are not the rights holder and therefore cannot speak or act on behalf of the rights holder.

For this reason, the suggestion will have to be declined. Thank you all for your time and effort."

So yeah. They already have things in place to search for plagiarized material. That is, plagiarized material that matters. So this matter is closed, and there's nothing more to be done about it.