“Under the central bank's proposal, the eftpos, Visa and Mastercard networks would be allowed to ban surcharges — something the RBA currently prohibits.”
The RBA can’t enforce a ban, so is relying on the networks to do it. The government could also legislate a ban:
“However, the RBA noted the government could ban surcharges in the future if they managed to linger.”
“American Express does not fall under the RBA's remit due to its structure so will not be covered by the proposed changes, but the RBA says it could choose to ban surcharging also.”
Even though Amex isn’t included, it seems logical it would face pressure to reduce its fees and potentially also implement a ban (and again, the govt could also step in).
This will have a big impact on reward schemes.