In the Americans with Disabilities Act, US law states that if you're going to create a place of public accommodation, there are certain minimum standards you must adhere to, to support those with disabilities. So you must install ramps and elevators for the mobility-impaired, offer audio-only interfaces for the blind, sign for the hearing impaired, and so on. These apply pretty broadly.

We can argue whether Australia's legislation is a good thing, but "if you are going to operate here, these are the standards you must follow" is not beyond the pale.