It's no-ones business if a small group of people get together and decide to share.
Actually it is ACMA's business if this is achieved by boosting WiFi signals beyond the regulated power level.
ACMA has complete and total regulatory authority over the entire Radio Frequency Spectrum.
Home built aerials can be radiating signals that exceed the regulated levels and are NOT an approved device under the regulations.
However, distributors and resellers should be aware that if the originally compliant device is modified in any way that could be seen to change the compliance of the device with the mandatory standard (eg. through modification of the antenna or addition of attachments to the device), as this will then be regarded as a new device. Consequently, the distributor or reseller will also be regarded as a supplier at first point of supply to the market and be subject to the ACMA's legislative requirements. This means that a test report stating the compliance of the device with the mandatory standard as outlined above must be obtained and a compliance folder compiled.
A person who knowingly supplies, operates or uses a non-standard device may be subject to legal action by the ACMA.
ACMA can, has and will fine people for exceeding these regulated levels, if it is causing interference.
ACMA recently banned Mobile phone boosters for exactly the same reason. Fines for possession and usage can be as high as $220,000.
Valuation for the name is $200 - $500 to Enduser