To the Victorian plumbers is this a new standard or something

Just looked though my local suppliers magazine and saw the recycled water fittings and noticed all the taps are 5/8th female inlet and states "commonly installed within victoria". Is this a new code for you guys. I understand why since people just take the vacuum breakers and reverse thread taps off and put a standard tap on it so it makes sense to put a weird thread to stop this. So is this a new normal or just a neich thing?