you had some degree of say
(emphasis mine). Notice the tense.
Things change.
I don't quite follow what the objection is. Suppose Alice and Bob design a simulation. They design it so that once started it will run with no interference from either of them or anyone else until it is done. Then Alice enters, while Bob does not; it then begins.
To the extent that this sim has gods, Alice is one. But there is no one outside with control. Also, the civilization did not all hop into the sim.
Very comprehensive analysis by Brian Tomasik on whether (and to what extent) the simulation argument should change our altruistic priorities. He concludes that the possibility of ancestor simulations somewhat increases the comparative importance of short-term helping relative to focusing on shaping the "far future".
Another important takeaway: