Polymarket, a blockchain-based prediction market, faces significant legal risks in mainland China, according to legal expert Liu Zhengyao. Unlike traditional casinos, which use human-operated tools to generate random outcomes, Polymarket relies on real-world event outcomes executed by smart contracts. This decentralized approach contrasts with the centralized management of traditional gambling, where casinos set odds and maintain a house advantage. The promotion of Polymarket in China poses greater legal challenges than mere participation, due to the country's stringent regulations on gambling activities.