Why would they do that
? Their business model is based on the fact that they can still have a good margin although they are offering low prices BECAUSE they don't have the costs linked to a B&M structure. Their logistics costs are kept quite low because they managed to secure excellent conditions with DHL here in Europe, and the booksellers with B&M structures are facing difficult times right now in UK as well as in other countries in Europe.
I am not denying the veracity of the information, but I cannot grasp why on earth they would go that road.