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Not disagreeing, but at some point this won’t be enough. Assuming companies aren’t already, “offline” devices will get shipped with the ability to utilize unsecured networks and/or other devices. Better hope any neighbors are privacy conscious too.*
(they’re not)
Personally, I don’t have the energy to go to such lengths. My “good enough” has been using AdGaud Home as a network-wide DNS blocker and connect my smart TV to it. It’s been great so far.
Plus, I get the bonus of seeing how much gets blocked.