Might have been the bike share bubble? Asianometry - China's Bonkers Bike-share Bubble https://youtu.be/FQrEDq8KPiU and China Observer - bike graveyard https://youtu.be/49xQ2sTkjwM

During: https://www.weforum.org/stories/2020/07/4-big-bike-sharing-t...

After: https://www.news8000.com/lifestyle/money/china-s-bike-sharin...