Like it or not, (and I suspect I'd share your thoughts on being out of pocket), @James2821, Airbnb were pretty straightforward with what would and wouldn't be covered in their EP policy.
The crux of it is (in a pandemic world), stuff like border closures isn't unexpected - and judging by what we read in the news here - it's near commonplace in Australia these days.
Many of us just won't book trips because of the uncertainty out there.