Lead. You have the classic Bloggs belief that only if it's mandated do pilots act responsibly.
Not true, Dick. As in false.
In Australia I reckon most pilots give a taxiing and inbound call on 126.7 where they think it is prudent to do so.
And I reckon you're probably correct, if the place at which they are taxiing or to which they are inbound is a marked strip or is shown in AIP has having a CTAF of 126.7.
But you are demonstrably wrong if you are suggesting those calls are being made on 126.7 by aircraft taxiing at or inbound to unmarked, uncertified, unlicensed strips in the 'J curve' or cattle stations in the middle of nowhere.
However, let's assume you are right and I am wrong.
If you are correct, it inexorably follows that there is no risk of these aircraft overtransmitting ATC instructions, and your scaremongering campaign about the 'CASA direction' is, at best, misguided.