I'd prefer for Una to gradually build everything 'in-house'.  Eventually have an app for what's most popular.  I don't know much about WeChat but from what I gather they seem to be doing good.  It would be amazing if Una was able to surpass the capabilities of WeChat but without the 'mobile payment' feature because only a select few would have the $ to request this feature and to run such a feature.   

Here is a cut and paste description of WeChat from the wikipedia page:  

"WeChat (Chinese: 微信; pinyin: Wēixìn; literally: "micro-message") is a Chinese multi-purpose messaging, social media and mobile payment app developed by Tencent. It was first released in 2011, and by 2018 it was one of the world's largest standalone mobile apps by monthly active users,  with over 1 billion monthly active users (902 million daily active users).  Described as one of the world's most powerful apps by Forbes, it is also known as China's "app for everything" and a "super app" because of its wide range of functions and platforms."

p.s. I'm not that versed in the mobile world... so my contributing comment here may not have substance.  I don't mind making myself look like a fool from time to time.  :)