The motivation was apparently not good customer service!
"Telco sources have told The New Daily that NBN Co halted its HFC rollout because of an order from the national consumer watchdog.
Pitched by NBN Co as a “new initiative”, the company announced on Monday it would temporarily pause the rollout of its hybrid coaxial fibre (HFC) technology.
Network engineering and telecommunications expert Mark Gregory said the sudden announcement was triggered by an instruction from the Australian Competition and Consumer Commission (ACCC).
“It wasn’t NBN Co’s initiative. The ACCC told them to stop it,” Mr Gregory told The New Daily."