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LG smart TVs caught logging audio with screen off and snooping on local devices
(www.notebookcheck.net)
This is a most excellent place for technology news and articles.
unless LG skips DNS entirely and hard codes its IPs.
Or more likely it'll just use DoH or DoT. DNS blocking is still effective but it's becoming less so as these companies wise up.
Oh right that might be a problem, but in that case we can make a subnet (as i suggested on another reply) and block any connection that isn't on specific addresses or IPs with a firewall