The credit of wechat's success should goes to the Crony capitalism of Communist Party of China. It is indeed a tool of surveillance of Communist Party of China
Wow, you created this account to just say this (noticed based on 政治需要, to meet political needs in English, your username). Being very cautious is a good habit. Not seeing this often these days. People in Chinese community are quite aware of what can not be talked publicly and simply shut those topics down themselves by ignoring everything related.