besides the other points raised, even within the observable universe there are some assumed infinities as well as things that might be infinite, might not be.

e.g. time and space likely aren't quantized, you have an infinite amount of points in between any two arbitrary points in spacetime. don't mention planck scale black holes, it's a meme and even most phycisists who like to cite it haven't actually thought about it for more than 5 minutes.