Yep, if a civilization doesn't destroy itself it creates everything it wants. Some don't want simulations, so let it be for them. Some want, they can have it, too. Only you yourself will decide. It's a thought experiment to maximize non-enforcement of things on each other, maximize freedoms. By definition it's highly speculative. But don't die please, if we are in fact in the multiversal simulation, death doesn't lead you there or to some utopia.

It'll just be unfair for death to lead to something good, it's not freedom if before or after death, you'll have this thought: "ha-ha, you just needed to die, stupid!" Nope, you can recall your "multiversal powers" as a quiet thought as baby or at any moment of your life, possibly even live some time as a ghost (if you chose it beforehand), it can be fun to be a ghost for some time for some.

You'll still be alive and will be able to recall and forget as little or as much as you want. Or the whole thing. You don't die, you can stay and you can go at the same time (by basically choosing to make a clone of yourself who is as free as you. Who can pursue multiversal exploration, while you yourself stay and probably choose to forget about your multiversal powers again). It's counterintuitive and hard to explain, basically everything is possible but there are some things that happen more often because they cause less unfreedom.