I do not know. You may be right. That's metaphysics. In practise you can't even tell whether the universe is like a movie or a computer game.

I.e. a movie on a film reel consists of frames that are created once and when you watch it looks like a coherent story --- but when you paint over some frames at the beginning, it has no effect on any other frame.

Whereas when you manipulate the state in a computer game --- say, give Super Mario that mushroom --- you change everything that comes later.

And for that straw man theory of causality: You can just exchange it for a theory that postulates a cause for everything _but_ the Big Bang.

(By the way, I do not believe in causality. At least not the kind of mono-causality exhibited in human storystelling, esp. stock market commentators on TV. Strangely I still manage to believe in determinism.)