Yep. And oddly enough, it was No Man's Sky that kicked it off for me.
The idea that a world would be generated on demand, at the time you need to see it, echoed of the very double-slit experiment you're talking about, which I'd learned of years before.
So that led me to reading and watching videos about the nature of reality, which inevitably led to Simulation Theory.
I mean, the logic is sound. Given where we are with computers today, from where we started, and what we use them for (like The Sims, or me pitting a world of AI against each other in Civilization VI), if you consider the exponential growth of our computing power, and then consider the vastness in both size and history of the universe, given enough time, why couldn't computational power somewhere, somehow, reach a point where every particle could be quantified, and thus a universe of them simulated?
Then you have Matrix-level questions of malleability of the simulation from within, the possibility of all of your personal history up until this very moment just being a program (so it didn't really happen, you're just programmed to think it did since the simulation actually just began 1 second ago), the question of existence once the simulation is terminated, or the idea of simulations within simulations within simulations...
It's a
lot of fun to think about. To me, anyway.
Welcome.