To me, with experience of numerous organisations of different sizes outside tech, it is pretty surprising.

(I'm not arguing that this is right but) the typical progression of an organisation as it scales is to move away from the 'scrappy startup with a CEO-dictator' and towards something more mature. Obviously, there are reams of business literature written about growing pains and then stagnation in large companies, but the single-personality-driven model seems hugely flawed - look at Tesla, for example. And I'd certainly expect a public company of the size, resource, and maturity (in years, if not structure) of Meta to have developed beyond this point.

Honestly, that a number of people seem to not grok my questioning this, is possibly quite revealing about the monoculture of the tech world.