How did TikTok go from silly dances to "How are the Chinese people better off than us?" In what seems like a couple of days?

I understand that TikTok is hours away from being banned. (Way to go US government and media for explaining this nuanced issue in a timely matter). But it seems like it took less than a week for TikTok to go from silly dances with the vague awareness that China is tracking our data to suddenly Americans seeing how Chinese people live and saying, "Wow, capitalism fucked us over. Chinese people sure seem happier than us."

When did this shift? When did TikTok start showing Chinese people living their lives and making it seem so appealing?