Fascinating.
https://www.nationalgeographic.com/animals/2018/11/wombat-poop-cube-why-is-it-square-shaped/

However, we still don’t know why it developed that way in the first place.
An interesting research project.

To assert that is the case would involve comparing essentially a 3-dimensional measurement (width of Australia across the surface of a sphere) with a 2-dimensional measurement (the diameter of the moon).

If Australia were plopped onto the surface of the moon, on the equator, on the side facing the Earth, I don't believe that it would span the entire visible surface of it, East to West (i.e. 1/2 of the moon).

A country on the surface of the earth (a sphere) doesn't really have a 'diameter', it's not the proper measurement. One should be comparing it to the circumference of the moon, which is 6787mi.

Australia is 2,511 miles wide, which is 36% of the moons circumference.

Ergo, if you took Australia off Earth and plopped it onto the visible side of the moon, it would not traverse the entire 1/2 of the moon that's visible to us.

At least that is how I believe one should properly compare these two bodies.