My Visa debit card has all of these protections.

Yeah, Visa and Mastercard debit cards carry the same fraud/abuse protections as a credit card. They usually don't cover all the extra crap the credit cards do (car rentals, etc) but they will absolutely give you your money back and perform chargebacks in cases of fraud or denial of services tendered.

Debit cards have exactly the same fraud protections as credit cards as far as I know in Australia.

Interesting. In Europe, with a credit card, you can effectively just say to the bank “nah I didn’t pay this” and it’s on the bank to prove otherwise (it’s harder/impossible where pin was used but in the web it’s fair game). Debit cards have protection for outright fraud (and even then somewhat limited), certainly no “umm no” simplicity.

Somewhat. You can have a charge to your account reversed, but it's not a common thing and the process isn't trivialised.

Source: almost accidentally undid an in-shop payment because their processor was based in a different town where i had never been. Realised at the last moment where the charge came from; bank was willing to undo.