Look up “megasites”, these are large settlements not called cities as they lack signs of being dominated by a subset of themselves. One I’ve heard of is called “Nebelivka” but I believe there are at least a few others known and probably others either not yet found or misunderstood as cities.
The job of CEO seems the far easier to replace with AI. A fairly basic algorithm with weighted goals and parameters (chosen by the board) + LLM + character avatar would probably perform better than most CEOs. Leave out the LLM if you want it to spout nonsense like this Amazon Cloud CEO.