The Australian government enforce at New Development Charge to greenfield developments that need to be connected to the nbnTM network.
Part of this charge is the End User Contribution Charge of $300 (inc. GST). Internet Service Providers such as More pass this charge to the end user when they want to connect to the nbn™.
Please note that this charge is only applicable if your property is a new development and has never been connected to the nbn™ before.
You can read more about this policy here.
The More team will alert you if the New Development Charge applies when you complete your address check as part of the signing up process.