You can tip Twitch streamers right from the mobile app
 

Bits are a staple of Twitch streaming. They're a way to back a streamer if you can't afford a full subscription, or want to offer some additional support. Until now, though, you couldn't easily buy them on your phone -- you had to either go through...

https://www.engadget.com/2017/11/08/...in-mobile-app/