Even without score spoilers, just KNOWING that millions of other fans are experiencing the same moment as you is as chilling of an effect as the game itself!
None. I genuinely never understood the appeal. I've watched it go from being basically not being a thing to being an incredibly lucrative form of celebrity in only a decade, all of my friends became obsessed with watching streamers, and I'm just like why?
Rocket launches. Sadly, SpaceX decided to switch exclusively to streaming on X instead of also doing YouTube. So you get like ultra low bitrate 360p video that refuses to load anyway.
Ones that are on-demand afterwards. I don't have the time to watch an entire stream in one go, and I hate missing out while I go to the bathroom or do chores.
I would watch a few TTRPG streams a few years back but the good ones offer podcasts which is much superior to live streaming. Nowadays the only thing I watch is the occasional smaller jackbox stream when I get an itch to play.
I often lurk on my friends' Twitch streams, whatever it is they may be streaming, to help support them. It is typically The Last Of Us that they are streaming.