The author notes some issues, like using it for place of birth. Now you need a temporal list for "countries that existed in year XYZ".
There are similar issues for shipping. Not everyone ships everywhere. If the list is abstract and unknown to me, how do I whitelist/blacklist? Am I supposed to know that Scotland exists in the list or not? What if it's for a passport input? Does Scotland have it's own passport? How do I deal with Taiwan without pissing off Chinese web site visitors?
Tldr: The list depends on context. I'm skeptical that a centralized list could deal with commonly used contexts.