@rysiek https://www.btwifi.co.uk/
I forget the SSID but it's something obvious like BT-WiFi. My neighbours have a BT router which advertises this SSID as well as their own SSID but their router's off now - presumably because they've gone to bed.
I'm not sure but I seem to remember that the owner gets priority on most of the bandwidth so doesn't really lose out much by it.
BT Wi-FiBT Wi-FiBT Wi-Fi