It's basically IRC with an enormous amount of bloat tacked on. Every time it upgrades - which is obnoxiously often - it'll have some new feature they want to force on me and I have to click on a popup to dismiss it so that I can do what I intended when I started it. And they've started injecting their politics into it too, which you'll see on startup now and then.

The mobile app is sitting in my "notification jail" folder three pages deep too, where apps that abuse badge notifications are kept.