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Xfinity using WiFi signals in your house to detect motion
(www.xfinity.com)
This is a most excellent place for technology news and articles.
I wouldn't trust them to not randomly enable WiFi, but you can also use their modem but disable any built in WiFi on it & still use your own router. ISPs continue to try to bundle their modem & router, which gives them complete access to your home network. Some lucky people have found fiber providers that let them use their own SFP.