Not because they cannot do it, but because why they're doing it, which in turn becomes what they're doing. America is being perceived as isolationist, so countries solve that by becoming isolationist about what software they use, whether its open source or not is kind of irrelevant, though in several cases the software will primarily be focused on the countries own language.

The better alternative in my eyes is to contribute to existing open source, and only if the US becomes hostile against this, fork said code and move on.