People created ChaosGPT just for the lolz. I know they know it's a joke, but there are plenty of crazy people who will not hesitate pushing the button to destroy the world if given the chance.
Nothing about how this is going to go is obvious.
A smart enough AGI, unless it's perfectly aligned, will end humanity (or worse - there are worse things than death), most likely by accident or just plain not caring. But it doesn't stop there. If that AI is self-improving, it could easily turn into a threat for the entire galaxy, or even the universe, unless it meets a stronger and better aligned (to its creators) alien GAI...
That's the alignment 101. But I worry people don't talk about alignment 102: a perfectly aligned superhuman GAI will not destroy us, but its very existence will turn us into NPCs in the story of the future of the universe.