One caveat about the Simulation Hypothesis I haven't seen anyone commenting on: however advanced and capable of capturing/producing energy our simulators might be there should be some finite energy spent for each simulation.
Assuming there are many concurrent simulations, minimizing the energy spent for each simulation seems to be an obvious objective for our simulators. One way is by sharing as much simulation data across simulations as possible and another would be by tweaking the simulated Physics to reduce how much of the Universe needs to be simulated (ie. supposing you are only interested in simulating Earth). Quantum MWI could be a hint of the former and The Holographic Principle could be a hint of the later.