Credit cards, credit-linked wallets and cryptocurrency: all three
People read the ban as being about plastic, and then find a route they assume is outside it. The three most common of those assumptions are wrong in the same way.
A digital wallet is not a payment method in itself — it is a container for one. If the card inside your wallet is a credit card, a wallet payment is a credit payment, and a compliant operator will refuse it exactly as it refuses the card. If the card inside is a debit card, the wallet payment is a debit payment and is permitted. The wallet brand tells you nothing; the funding source is what matters.
Buy-now-pay-later is a credit product, and so is a line of credit drawn into a transaction account. The ban is written against instruments rather than against the history of money already sitting in your account, which is why it bites at the cashier rather than at the source.
Cryptocurrency is named in the ban as digital currency. That is the point worth carrying into the rest of this site: a cashier that offers you crypto deposits is not offering you a clever workaround. It is telling you that it is not a provider Australia licenses, because a licensed provider could not offer it.
The lottery and keno exemption, and why it confuses people
Lotteries sit outside the ban. ACMA's guidance notes the restriction does not extend to other gambling products such as lotteries, and reporting at commencement said online lottery and keno products could continue to accept credit card payments.
This single exemption is the source of most of the confusion. Someone buys a lottery ticket online with a credit card in the same week that a sportsbook refuses one, concludes the ban must have been repealed or never applied, and tells everyone else. Both things are true at once: the product class is different, and only one of them is covered.
If you want to test what a cashier is, this is a useful question to ask it. A cashier offering credit cards for a casino or sportsbook product is outside the Australian regime. A lottery or keno cashier doing the same thing may be entirely compliant.