I feel like this argument doesn't work in all cases, because of course there are densely populated parts of America. Massachusetts is 7,800 sq miles of land and 7 million people. New Jersey is 7,354 sq miles and over 9 million people, so almost double the density of Switzerland!

So sure, nationwide policies in America have to account for all the empty space, but there's also wide swaths of the country that have relatively normal (if still overall low) levels of density. What's stopping MA or NJ from starting a similar scheme to the one in the article? Probably a lack of funding, state capacity, and political will.

If anything, the comparison probably falls apart because Switzerland is filthy rich. Apparently their GDPPC is $126k vs America's $94k, and crucially, I suspect the former is much more evenly distributed. All I have to go off of is visiting once, but it's certainly a very expensive and well-maintained country.