Slightly different but related thought: what if inside of each black hole singularity is another universe? The stuff it collects ends up in this other universe. Which would mean our universe is just "inside" the black hole of another.
Then perhaps the accelerating expansion of spacetime we detect here has something to do with the accelerating accumulation of mass of our "parent" black hole.
Then perhaps the accelerating expansion of spacetime we detect here has something to do with the accelerating accumulation of mass of our "parent" black hole.