What is Reddit's opinion of RuneScape Companion?

From 3.5 billion Reddit comments

Check out "RuneScape Companion" https://play.google.com/store/apps/details?id=com.jagex.RSCompanion

RS Companion app already exists. iOS Android

RS Companion

EDIT: added link to google play

assuming you mean This or This, yes.

as another comment shows, it's simply loading This page using Adobe Cordova's Webpage viewers (WebView:Android/Safari:IOS) to display that website. (and includes push notifications)

You downloaded an app from Jagex and thats why you think you got banned?

Is this the app?

https://play.google.com/store/apps/details?id=com.jagex.RSCompanion&hl=en