Plato’s “the cave” thought experiment (circa 400 BC) is basically a suggestion of simulation. Modern science agrees - human perception of reality is limited and effectively a simulation. You don’t need modern digital technology to imagine living in a simulation.
After a brief search I can’t find any mention of any punishment for Sisyphus if he stopped pushing the boulder up the hill. That said, this is all taking place in Tartarus so there probably isn’t much else to do and endlessly push a boulder up hill might be the better option lol. I can relate.