Moreover GPT is trained on material in multiple languages, so having ChatGPT have a neutral bias in the context of American politics would be very strange. Achieving that would probably put it pretty far right on a global scale.
This is more a function of more proportional representation systems than anything else. Both the US and UK have first past the post, and in both of those countries both the more extreme left and right politicians are part of the major parties, whereas this happens less in more PR based systems.
Would it? Compared to Europe, sure. But I always had the impression that most of Asia skewed rather further right?