I believe they are doing something more sinister than storing a plaintext password. Why would they even check the contents of it? That the banning came with a

I believe they are doing something more sinister than storing a plaintext password. Why would they even check the contents of it? That the banning came with a short delay makes me guess that they scan all input to their app, indescriminately. They just send all keystrokes to their censorship server and check them there, and apply penalties if neccessary. The reason they would do this is because WeChat is actually many apps in one. Third parties can embed mini apps as HTML pages in their profiles. For example, when in China I used a WeChat applet to control a coffee vending machine. In order to monitor content in every app, it makes sense to just blanket scan the inputs. Someone brave could test this by typing offensive things into some text field but not submitting them.