Late response because life, again, which is how I keep missing your streams, but I enjoy answering Knowledge Seeker Ayy.
1) Creation streams. Art, be it digital or traditional. Non-singing music creation, be it digital or traditional. Knitting, handicrafts, cooking, whatever. Because I don't have any creative capability, I enjoy watching things be made.
2) Probably not, unless you mean it in the strictest sense. Vidya acts as a springboard for discussion into myriad topics, ranging from philosophical tangents to mundane life stories.
3) Go on passion fueled spergouts about their interests. If the chuuba enjoys a thing, and they can elaborate, expound, and explain that joy to their audience, then it makes for engaging conversations.
4) For general appeal, probably only instrumental music can come close. Music is ingrained into the human psyche, it's one of the very things that makes us human. It's hard to beat for appealing to the most broad swathes of viewers.
5) A little of setlist, a little of request. If there's a setlist, that implies some level of familiarity and security with the items in the list. Sometimes the audience can mention something that the chuuba overlooked, and magical moments can happen as if we were all in an actual karaoke box together and stumble upon a song that makes us immediately go "HELL YEAH"
6) I've stated before, I'm stating now, and I'll state again; enthusiasm is KING in karaoke. Unless you have the flattest intonation in the universe, putting SOVL into singing will make for a fabulous time. Listening to skilled singers flex their lyrical prowess is nice, but the effect of incremental improvements as a function of repeated practice fills the heart. The allure of idols is growth, and cheering it on so that it blooms into its full potential. There's something magical about it.
7) I might be less content than I thought after the revelations brought on by yesterday's spontaneous melancholia, but still probably net positive. I'm worn out in ways I thought would be a number of years out, and reflecting on my road in life has left me rather navel-gazing. I could definitely be worse, but the "for want of a nail" thought exercises I keep finding myself entertaining fill me with a general sadness that I can't quite beat back completely. Such is the human condition, probably.