3 possibilities:
- We are not living in a simulation.
- We are living in a simulation, but it is a "perfect" simulation. There is no way to determine if we are in a simulation from within the simluation.
- We are living in a simulation, and it is not perfect. It could be exploited from within itself.
By far the most likely is 1 or 2, based on what we've observed, imho.