The urban mega cities are a prop that the CCP puts on display for the world. There's a reason that China's GDP-per-capita lands somewhere between Kazakhstan and Cuba.I would know because I've been there. If you go to a random exurban part of China you're going to find people living in makeshift tin structures, a lack of running water, oxcarts used as serious transportation, and a society that is functionally in the 1930s.

The CCP are masters of propaganda though, and flood Youtube and social media with influencers riding around on maglev trains and showing off new airports and architecture. Even on American Social Media, if you look for videos of "The Real China", or "Chinese Poverty" you'll get carefully curated propaganda that does not line up with what I saw first hand.