I don't get what's not to get about that.
No need to be a condescending jerk.
The platform didn't put a stop to torture on their platform. They are responsible for that.
Why are they responsible for a grown adult making his own choices? What about an audience who directly funded the activity? Are they not even more directly responsible for the event that occurred?
The others streamers tortured a guy to death. They are responsible for that.
Yes, there's probably some question about whether manslaughter laws might apply.
Given it was a voluntary participation, how is this different from any other activity that involves potential self-harm? If a bunch of people freeclimb a deadly mountain with a 20% chance of death and stream it, and one of them dies, is that illegal? Assuming not, what's the difference here?
What exactly do you think the the dead guy is responsible for?
His choice to participate in an activity that killed him.