My worry is that the definition of "Chinese users" will be expanded. Right now the assumption is that it's for Chinese citizens, but of course, anyone who registered an account while in China is also thrown in that pile. I have to wonder if this will someday include Chinese citizens who've been living abroad and created accounts while outside of China, people with former Chinese citizenship who've taken another country's citizenship, their children, and so on.

Wechat's surveillance is pushing the idea of what should be monitored by China. It's a real possibility that this will expand into foreign companies with operations in China.