Earlier quoted context omitted.
Yes, if this were an adult human OpenAI employee DMing this stuff to a kid through an official OpenAI platform, then a) the human would (deservedly[1]) be arrested for manslaughter, possibly murder b) OpenAI would be deeply (and deservedly) vulnerable to civil liability c) state and federal regulators would be on the warpath against OpenAI Obviously we can't arrest ChatGPT. But nothing about ChatGPT being the culprit…
IANAL, but: One first amendment test for many decades has been "Imminent lawless action." Suicide (or attempted suicide) is a crime in some, but not all states, so it would seem that in any state in which that is a crime, directly inciting someone to do it would not be protected speech. For the states in which suicide is legal it seems like a much tougher case; making encouraging someone to take a non-criminal action…
Fun fact, much of the existing framework on the boundaries of free speech come from Brandenburg v. Ohio. You probably won't be surprised to learn that Brandenburg was the leader of a local Klan chapter.