So at least from that angle I see it as an easy “government is actually trying to be more efficient” argument.
As a user cash is a pain in the ass. I have to count it out, keep it in my pockets, etc. So much easier to just tap my phone or my card. But yeah that’s a tradeoff in the classic “You’re trading X for convenience”.
Combined with the fact almost no one uses cash in Australia.
They are in theory still possible to destroy but it’s a lot harder and the little electronics left are cheaper to repair.
Every council I've lived in has still taken cash for every type of council fee, despite their "official" statement being they don't.
Is there some law saying they can’t?
This is a carpark. If you own a car, you are legally required to hold a CTP insurance policy as a condition of registration-so to be able to use the facility, you legally need to be customer of one type of private financial institution; given that, is it really problematic if council requires you to be a customer of a second kind as well, when close to 100% of the population are?