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LG smart TVs caught logging audio with screen off and snooping on local devices
(www.notebookcheck.net)
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You'll also have to make sure to properly destroy it afterwards. If you re-sell it, the next owner might connect it to the internet and all the stored data will get uploaded.
Also there's tech like Amazon Sidewalk that allows devices to talk to other devices nearby in a mesh, bypassing your router entirely.