There is no one "Amazon" here, there are at least 3:
* Twitch: Essentially invented live streaming. Fantastic.
* Amazon Interactive Video Service [0]: Essentially "Twitch As A Service", built by Twitch engineers. Fantastic.
* Prime Video. Same exact situation as Netflix: original expertise is all in static content. Lots of growing pains with live video and poor reports. But they've figured it out: now there are regular live streams (NHL and NFL), and other channel providers do live streaming on Prime Video as a distribution platform.
[0] https://aws.amazon.com/ivs/