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Cisco operates from the ISP side, they’ll poison DNS through their routers. And you should be aware that your ISP will employ Deep Packet Inspection which can also be done with Cisco routers. That means they can intercept internet traffic, especially if your internet connection is not encrypted.
ISPs were already required to block the sites. I don’t think an additional block on the Cisco side would change anything in that case.
Guess ill be trying my hand at building my own pfsense router