They all have massive limits on their powers as compared to a CEO. They work with parliaments, etc. They can be vetoed easily.
I'll grant it isn't a perfect analogy. A CEO doesn't have unlimited power granted by god and has to answer to a board and therefore shareholders. But in essence, the idea of having a singular ultimate decision maker/leader rather than having a small group vote on decisions or have the entire company vote makes it a de-facto monarchy.
Your analogy is, again, rooted in lack of knowledge(aka ignorance) of corporate structures.
The CEO of my startup right now, where she literally owns 51%, still must go to the board for any impactful decision. And any C level exec can call the board.
LLCs are generally autocratic, but that isn't "any corporation".