Not only that, if you have home internet they will pimp it out to nearby cellphones because that helps patch up weak network connectivity in certain areas.

Comcast / Xfinity definitely does this. I have gotten many 'suspicious activity' CAPTCHAs on popular websites because of this and the routers provided by Xfinity are very locked down so you can't do anything about it.

Let's not even get into WiFi Motion which I'm sure is enabled by default in most households [1]

[1] https://www.xfinity.com/hub/smart-home/wifi-motion