If we are in a simulation, then (a) at least one universe, ours, is a simulation; and (b) at least one world includes a simulation with sentience. This gives some evidence that being simulated or being a simulator are not too unusual, and the stack may lead way down to the basement world, the ultimate unsimulated simulator.

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[1] If there is a stack of simulators, with one world simulating another, the "basement level" is the world in which the stack bottoms out, the one which is simulating and not simulated. This uses a metaphor in which the simulators are below the simulated. An alternative metaphor, in which the simulators "look down" on the simulated, is also used.

Or maybe there isn't a basement universe. Maybe the stack never bottoms out. Think about it do you actually need one of those or are we just assuming you do because we assumed we lived in an unsimulated universe for most of our lives?

The basement universe if it exists seems likely to have certain odd traits.