I have a nice thought experiment I like to do with people when confronted with "AI can't do x". Let's go back in time. How much do we need to go for this to become true? So let's try the 2000s.
Say you get a "fable/mythos/sol/gemini/kimi/glm/deepseek/whatever" in a box (and let's assume no guardrails). And you go back to the year 2005. It's "20 years ago", the world is slowly building back from the dotcom bubble, the Internet is really starting to happen, more and more things are interconnected, more and more things are connected to the Internet. Cool.
(for a bit of context, around that time we also saw the first high-impact worms like blaster that hit massive amounts of computers even reaching nuclear powerplants, we had a ton of ssh exploits that even made the movies, and security in general was a "nice to have")
I'd say that with the uber-model-in-a-box and a few prompts, you could reasonably make a case that you could design a worm that could infect 90-100% of the things connected to the Internet back then, stay as hidden as possible (in-memory stuff, vm execution, etc), move laterally into any network at inhuman speeds, and infiltrate almost every interconnected computer that has a link to the "public Internet".
Would that qualify as "take over the world"?
Then you could ask "what happens in 20 years from now?". And, thankfully, now we'll also have the AI on the blue side.