I bet ChatGPT would find a morphologically complex language such as Sanskrit or a Bantu language harder to learn. – Also English is remarkably context-free. Japanese is the opposite of that: you literally can't say anything without taking into account the relative position of speaker and listener. (For example there's no single word for "that" in Japanese: you have one for "that thing away from me but close to you" and one for "that thing away from both of us". And everything is like that)