This sounds like one of those ideas that's mathematically very pure but sort of nonsensical otherwise. Basically there are an ~infinite number of universes being created every 1 'units of time' where that unit is ~0.

IDK, I guess the whole speed of light thing is really silly too in a way, but that's provably true.

This just feels really nuts. I guess it's like... where do all of these universes live? I get that our universe expands into whatever, but that seems trivial compared to a theory where every single quantum action leads to a new universe.