"India have 18 million broadband users". It means the rest of the people and businesses don't have (wired) broadband. Even in a municipality such as mine, Jio can get at least 1000 *new* connections in no time! They wouldn't concentrate on converting existing users, because, wired broadband users stick to their ISP longer. For example, if Airtel provides the same price and speed as JioFiber, I don't think Airtel users would make the switch. Where JioFiber could win over Airtel is in the add-ons (such as IPtv, IoT, etc).