This makes absolutely no sense. If you go to all of the expense to run a line to a customer, why on earth would you run a line that is only capable of handling the odd email? The cost of laying the cables is the same whether you put down optical fibre or a twisted pair. The cable cost is almost insignificant the in scheme of things. The barrier to entry for competitors is the cost of laying that cable, not the speed of the service. What is hindering competition is the existing providers refusing to provide service in areas that their competitors are servicing.