Those competitors would still have to pay rent to the company that originally laid the fiber, for prices regulated by the government. The open access regulation

Those competitors would still have to pay rent to the company that originally laid the fiber, for prices regulated by the government. The open access regulation ensures that all the additional services like * whether it's easy to get to talk to a human on support * whether there is TV streaming packages * whether CGNAT is used or dedicated ipv4's are exposed * whether there is ipv6 support * upload and download speeds * how much the service gets worse in the peak hours etc, would be entirely decoupled from who invested into the last mile infrastructure. It would be prohibitively expensive (and wasteful) to require competitors to lay a second set of fiber cables next to the existing ones, because in the end it's all paid by the customers.