said by sandman_1:
The DMCAs being issued were because of the indexing sites like Matrix. The algorithm that the copyright trolls are using is nothing more than a glorified spam filter. In other words, they were using these indexing sites to do their work for them. If they didn't have "public" sites to work off of, I guarantee you that the DMCA notices would drastically reduce on their own.
I believe the indexing sites were nothing but a tool to do a little "clean up" to get the harder to find articles that their own newsnab type indexer may have missed.