There's an interesting paradox there. First, it makes perfect sense that given our rate of technology improvement that in a not so distant future but certainly in the next few thousand years we could make a simulation with fidelity such that participants wouldn't be able to distinguish it from reality. And given the age of the universe and how often life should arise, it seems almost certain that multiple civilizations would have reached that point long ago. But here's the paradox. If even handful did reach that stage and create these simulations, then inside each simulation there would be multiple civilizations that reached the point of creating simulations of equal fidelity. And the civilizations inside those civilizations.... You then rapidly you come to the point that there isn't enough energy in the universe to run all those exponentially nested simulations.I think we are living in a computer simulation.
Everything (matter and thoughts) is just simulated from Bits&Bytes by a program.
Who are the operators? AI that overran its creators?