As the ABC suggests the regulations vary between states, and councils.
Qld has a state govt requirement, that is varied by local governments. Some LGAs provide different advice on whether you are rural or urban residential. Enforcement of the backyard fire requirements, may depend on neighbours dobbing in neighbours and a council keen to act. Hence common practice may arise that is not compliant.
Our residential neighbours light up often assuming they are ok because their fire is less than 2x2m x2m high. They obviously use a Standard Glass House metre as their measure, a hop step and a jump = 1SGHm.
The other out is where permitted In Qld, outdoor fires are ok for cooking food and warmth per the State. State trumps council. You just need to read selectively. Cairns as @Fred123 points out is more restrictive. An outdoor fire in the tropics? Guess if you make it Smokey enough it will keep the mozzies away.
Per Qld Rural Fire Service.
It’s worth checking with your local council and fire services, rather than relyIng solely on neighbourly advice.
Bunnings and their like could provide a warning and correct area advice with sales. At risk, not needing so much floor space for their outdoor fire products.