That kind of legislation usually is only relevant for the "incumbent" (because the rules usually state "if you have more than x% of the lines .."), i.e. the ex-

That kind of legislation usually is only relevant for the "incumbent" (because the rules usually state "if you have more than x% of the lines .."), i.e. the ex-monopoly provider who didn't build anything. It was build by tax payer money and then given to them.