You get access to the wifi network on other routers. You don't get anything else in return - this is included in the cost of the bill. You can phone them and

You get access to the wifi network on other routers. You don't get anything else in return - this is included in the cost of the bill. You can phone them and get them to disable it on your router. Their routers seem to have no QOS - one computer doing an update will kill internet for others in the house, presumable this is the same if other users are on the 'BT Openworld' wifi it shares.