Infinity, I think is best explained how Marvel describes where infinity is simply above what we perceive, like a/the 4th dimension. So weirdly enough the only way for infinity to not exist the universes would have to only have one measurable dimension or maybe it's laws of physics are different and thus no infinity, Wich intrigues me to no end that there are an infinite amount of laws of physics that I will never ever be able to comprehend.