[dredmorbius]

The fact much research is tax-subsidised is one but not the only argument for open public access to scientific research papers. Other arguments argue for broader access.

And tax-based support alone does not argue for closed access to a single country. There are tax-supported activities which aren't limited to benefiting, strictly, any or all of: taxpayers, citizens, or even residents of countries, among the latter foreign aid and cultural support.

The last of which scientific knowledge is an element.