The key is that AI is starting to design AI now, in a semi-uncontrolled manner with no “human in the loop”; this is creating a vicious feedback loop with capability growing exponentially and no reason to believe “welfare of the human species” is in any way represented in the system.
If this were to remain as “video cards in a lab” running LLMs, we’d seemingly have little to fear, but, of course, bits and pieces of it will be one incorporated in every important consumer product and even industrial system, even military; that’s when AI gains control of us.