Agree with TheUKHighStreet - don't just delete or mark as disused a restaurant just because the chain has closed down. Could well be that the franchisee continues on their own. If nothing else, the presence of a "wrong" POI signals that this part of the map needs resurvey. If nobody has noticed that *this* pub has closed, what does that say about the 20 businesses in the vicinity that do not happen to belong to a chain?