They're not unheard of in cities. Hotels and shopping malls have them. Some residential ISPs will also broadcast a public access point using a slice of each customer's bandwidth allocation...

Another reason not to use ISP hardware. That's on top of a well-known backdoor (https://en.wikipedia.org/wiki/TR-069).

When I had Comcast internet, I could get on those, but it required a network profile to actually connect to the internet. That said, I wouldn’t put it past TV makers and Comcast to collude on using this to allow backdoor network exfiltration.

They all have captive portal for regulatory reasons though.