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Google, Cloudflare & Cisco Will Poison DNS to Stop Piracy Block Circumvention * TorrentFreak
(torrentfreak.com)
This is a most excellent place for technology news and articles.
Note that with just pihole you would still be affected by this, since pihole needs an upstream dns server to get it's data from.
But if you set up pihole with unbound you will be OK, since unbound then will do the job of getting data from the root servers without another upstream dns.
I my experience it is also faster.