Fascinating thoughts from our man Elon ....
If many sufficiently advanced civilizations exist, and if they're likely to create simulations of the universe (or a slice of it), then we are almost certainly living in a simulation.
and to put it into perspective, Elon points out ....
"Forty years ago, you had Pong, like, two rectangles and a dot. That was what games were. Now, 40 years later, we have photorealistic, 3D simulations with millions of people playing simultaneously, and it's getting better every year (...) If you assume any rate of improvement at all, then the games will become indistinguishable from reality."