The NBN’s huge fixed costs require that nearly every Australian household subscribe to the network in order for it to be financially viable. However, as more homes abandon the NBN in favour of wireless options, including 5G mobile and Elon Musk’s Starlink satellite internet system, the NBN’s fixed expenses are shared across a diminishing subscriber
5G does have a congestion problem at peak hours as well, meaning that Telstra and Optus won’t sell you 5G home broadband if there’s already too many subscribers in your area.