As a content creator there's many ways in which your fans can help your channel grow.

As a Follower: meaning they click the follow button under your content, get notifications when you go live or upload, and generally interact with your videos proactively.

As a Sub: this is more for fans of your content, Subs actively contribute $5 a month to your channel and are invested in seeing more content from you and help you create it. Most Subs are also Followers, but you don't have to be (if you want to drop in when you want and don't need the notifications)

The $5 monthly donation given to you by a sub is yours to keep 100%, Rumble doesn't take a cut from this. Anyone who want to Sub to your channel must first donate to your channel via paid rants, and the option will reveal itself to them under the chat window when they press the "$"

 

Example: