Use of banned chemicals for ripening of fruits

I will check if ethylene is banned or illegal in Australia
I am reasonably sure its not illegal
I am sure its extensivly used for banana ripening
Its also naturally occuring.

In the old days carbide was placed in water to give off acetalyne and ethalyne to degreen citrus
Valencia oranges in hot weather turn green and ethylene returns the orange colour
Some unscrupulous stone fruit growers used ethylene to artificially ripen early season plums...which just produced tastless bags of water

If you have a gas stove, a compost heap, a fruit bowl you will be producing ethylene gas
Ethylene is also heated and presurissed to produced PE which is used for pipes and softdrink containers

I worked on a mango farm in my youth.  You'll never eat a mango from any store that's as nice as one that's just fallen, due it being ripe from a tree.

But it's shelf life is less than a couple of days.

It's no surprise given that the majority of us don't live near farms that the fruit and veggies have to be harvested before they're ripe in order to be transported to us so they remain "fresh".