Answer: There is nothing, this is all just hypothetical.
I don't know why this feels satisfying to me, but it feels coherent to imagine that there is nothing, and that all of this is just a hypothetical pondering itself.
Or maybe some things exist, and other things anti-exist, and the net amount of existence is zero.
I'm sure this answer is total nonsense, perhaps the real reason I'm interested in it is that I'd like to know why this brain seems to intuitively accept it. (Similar to why so many people want to accept "We're all just different facets of god having one big playful experience" when we are in fact obviously distinct)