paid for by their taxes
Isn't AsA self-funded? If anything, those "pesky private citizens in their aircraft" are flying around in a system predominantly paid for by the passengers sitting in airliners (so it's irrelevent if Qantas does or does not pay corporate tax, as long as it pays it's nav charges. As much as people jump up and down about a Fire Service at Ballina, the ARFFS is paid for from
Airline landing charges, so if you wander in in your bugsmasher, I imagine you are getting the Firies for free).
From the ASA website:
Our services are funded through revenue from our airline customers under a five-year pricing agreement
Additionally from the ARFFS site:
Our costs are recovered through a landing charge paid by airlines.
Flying through military airspace and using military facilities, yea, I guess those would be tax-payer funded, but really, how widespread would that be? At the end of the day, I can't drive my car through Puckapunyal or Canungra either (and they don't take the fences down if they are not exercising).