system
A chat on subreddit /r/NoStupidQuestions
human
First, at this point, that flag is all white due to UV damage. So, it would lack a certain significant visual shock effect.

Second, it would probably cause a diplomatic overreaction by the US and probably many supporting countries that would make it really not worth the effort.
gpt
I dunno, China surrendering on the moon would be a pretty significant visual shock effect.