I wonder if these will be capable of lending spare (encrypted) bandwidth to anonymous mobile devices. I.e., can Google Fi[1] users benefit from Wi-Fi when walking past a house that has an OnHub running?
>"When you buy any BT broadband package you receive unlimited FREE access to BT Wi-fi, the UK's largest wi-fi network, plus millions of Fon hotspots overseas. Simply use the BT broadband email address and password you were given when you joined us.
>"To get the FREE service you'll share a small, separate and secure portion of your home broadband connection with other members of the BT Wi-fi community. This is what creates the millions of hotspots you can use out and about." (http://www.btwifi.com/help/login-with-bt/help-broadband-cust...) //
In other words "you can't buy a BT broadband package without giving your router to be used as part of our wi-fi network". Marketing, probably most users don't realise they're part of the "wi-fi network"?
Also, the guest network traffic needs to be sent over a vpn, so you are not responsible for it / don't have to deal with people torrenting, etc on your network. And it should be low priority traffic.
A VPN or similar system to make sure you're not getting accused of things their free wifi is being used for too is a good idea. Not sure if anyone has done that yet in the various implementations.