^ I have a few thoughts on this:

1. This is why I don't own any of these devices.

2. If you own these devices, it is safest to have them on their own VLAN.

3. The idea of using customers' hardware and connection for a public mesh network can go straight to hell.

3a. I know some ISPs do this with their wireless gateways. That's why you should not use them, and buy your own if possible.

4. Corporate espionage should be illegal.