Well, they don't need to build out conduits + fiber, only fiber since the idea is encourage their monopoly over the last mile. They just need to do what is happening today on the private side and run a fiber (which is cheaper for each individual player). Then encouraging everything other than the last mile to be private sets up all the right incentive structures as far as I can see to solve a lot of problems of broadband internet access.
You can see this model in very similar markets, where some countries run the cell network as a national utility. But your actual carriers are a large choice of companies connected to that network that differentiate on service, price, and added on features, rather than the amount of capital available for infrastructure investment.
You can see this model in very similar markets, where some countries run the cell network as a national utility. But your actual carriers are a large choice of companies connected to that network that differentiate on service, price, and added on features, rather than the amount of capital available for infrastructure investment.