Every other universe is unique
Sorry, not possible, with infinite universes. Take any state of any universe, and , in infinite multiverse theory, that state has occured and will occur an infinite number of times.
Maybe more like a google of universes then. I just don’t see it. I see a flaw in that thinking and since it’s just a theory we can agree to disagree.
There is no infinite dark matter because multiverses exist. And visa versa
What's the flaw? You are the one who has more explaining to do. For instance, you have to argue why there are a google of universes, but not "a google and one" universes.
Are you familiar with the pigeonhole principle? Basically, if you have 10 pigeons amd 9 pigeonholes, you can conclude that at least one pigeonhole exists that contains at least two pigeons.
Now, a finite universe only has a finite number of possible states. These states are your "pigeonholes". And in an infinite multiverse, you have an infinite number of pigeons. So, we know at least one pigeonhole (possible state) has at least two pigeons (duplicate universes).
From here it is easy to argue all the pigeonholes contain infinite numbers of pigeons, as you can argue that no one state is any more "special" than any other.