I think Asciinema live streaming is a new feature I used it this summer to share terminals from one of my jumphosts. For the security part I only did "anyone can watch" which was usable but felt a bit lacking when I tried to use it. There are lots of UX gotchas with doing screen recording of terminals worst one is that a good broadcast is always a small screen, but when I work I want lots of data.
Kubernetes is awful at displaying secret stuff when sharing live terminals for showing ops.