Because then some construction company would lay fiber and not hook it up. Or hook it up, but put a 10/100 switch on the other end. Or hook it up, but throttle

Because then some construction company would lay fiber and not hook it up. Or hook it up, but put a 10/100 switch on the other end. Or hook it up, but throttle everything coming through it. Or ... They're incentivizing "offering a service", and it's better for that to come as a discount on existing revenue rather than free money.