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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.
Yup, this can get used for very scary stuff. As you said it's low bandwidth, but since edge devices are more powerful that's less of a limitation than you might think. A TV could easily do speech to text, rough ACR, and device fingerprinting all locally without any internet connection, then summarize and compress that data for a daily or weekly upload. No need to send the large data itself, just a a small report that's a few KB in size.