> If you assume instead that the whole universe has angular momentum, well, where did that come from

Would that be same kind of question as “where did the Big Bang come from?”. That’s a lot of energy that came from somewhere as well seemingly for no good reason.

I also wondered immediately about dark matter; could it be that’s where the counter-balance of momentum went? Like most galaxies spin one way and most dark matter would then have to spin the opposite way.

I am not a physicist so this is all random guessing of course.