I assume you are replying to this part? > WeChat is more akin to a web browser than having multiple "apps" inside it >> Apple bans alternative web browsers to

I assume you are replying to this part? > WeChat is more akin to a web browser than having multiple "apps" inside it >> Apple bans alternative web browsers too... so.. If they use a different browser engine they are currently banned but you can wrap Safari/webkit like every browser app on iOS does and provide different chrome/features. WeChat isn't embedding a different rendering engine, just using webkit.