Great question, we don't have any user caps or limitations as we pass through bandwidth costs. The bandwidth costs are pay as you go.
For reference: Live encoding of input stream ($0.07/min), video stream delivery ($0.0013/min) and video storage ($0.003/min) apply. Billed at the end of each payment cycle.
That's one of the problems with running streaming on AWS. While your objective normally is to increase your audience it also means that you will pay more and more. That's why we switched to a cloud provider that doesn't charge for traffic.
For reference: Live encoding of input stream ($0.07/min), video stream delivery ($0.0013/min) and video storage ($0.003/min) apply. Billed at the end of each payment cycle.