Must be related to employee rights, either something highly specific that is a dealbreaker to them (what would Austria have that Germany has not?) or it's a growing list based on precedence, likely full of permanently encoded biases depending on whoever was the initial candidate.
It's mostly related to employment entity complexity vs. organizational demand for that location.
To operate legally as a business in most of those countries on that list adds complexity that leadership has deemed "not yet". Doesn't mean forever, just means, not yet. I've seen countries come and go off of the list.
In Argentina, same pay for the same job is a constitutional right. If they hire someone here they would get a lawsuit asking for Silicon Valley payment.
