The standard reply re the subsidy is that Airservices are NOT paying it.
The Major Airlines are supposed to be paying it from savings from Air Nav charges which is supposed to be a flow on from Airservices savings.
I don't know how viable the arguement is for Airservices to NOT collect Air Nav Charges.
The major Airlines are struggling to pay for their fuel these days.
There is a real concern that a CASA mandated ADSB fitment will impact greatly and negatively upon the GA industry if the subsidy is not paid for by the Airlines.