To be clear, no legal business can operate in China without signing the users' rights away to the government for surveillance operations. This isn't even a secret. Even Apple has signed over its servers to be put in China so they can scrutinize their own apple-owning citizens.
This is not something you want to have any of your personal data or views to be shared on, imo, especially now they're integrating their mass surveillance system(literally called 'skynet') through all social media apps within China (weibo, wechat etc)
(I live in China)