"Traders wanting to buy bitcoin, tether or other cryptocurrencies also use social-media apps such as WeChat and Telegram after getting referrals from their friends, according to people in the country. Dedicated groups on these platforms allow buyers and sellers to find each other without the need for an exchange to match them. Chinese crypto traders also use some old-fashioned methods to flout the rules. These include meetings in public places, where they exchange addresses of crypto wallets, according to people with knowledge of these trades. Traders either swap crypto directly, pay in cash or arrange bank transfers."

https://www.wsj.com/world/china/laundromats-and-vpns-how-chinas-crypto-traders-are-evading-the-rules-8511ebe8?st=8rvqg51e5yoiw6x