Incidentally I did stream Wrath of the Righteous beta phase 1. Though it was only really intended for friends, I kept getting a consistent 15+ viewers or so, even though I was mostly silent throughout.
Then again, I was probably the only person streaming far into the beta (most others evidently stopped towards the end of act 1), and from what I've heard, literally every other person streaming was testing out one of the mounted combat classes or doing crazy multiclassing. Which apparently annoyed a lot of people because mounted combat mechanics were still in a rather buggy state in beta 1. I just stuck with my usual Eldritch Archer and keeping all of the companions single-classed.