Crypto conventions used to be quite the scene in Shanghai : fancy venues in five-star hotels, rooftop bars overlooking the Huangpu River at The Bund, where Crypto conventions used to be quite the scene in Shanghai : fancy venues in five-star hotels, rooftop bars overlooking the Huangpu River at The Bund, where chandeliers gleamed above well-dressed, champagne-sipping attendees, going out to clubs. Used to chat the night before where more champagne is poured. That scene is no more when China ’s “zero COVID” policy has turned a buzzing city into a ghost town. Some residents have reported being locked in…