Many worlds is a fairly common stance with physicists. It's what happens when you take the equations of quantum physics at face value.
It has a major problem that has yet to be solved (i.e what the hell does the born rule[1][2] (the rule that gives the probability of a particular observation) even mean in the context of many worlds?).
I sort of believe in it and don't believe in it at the same time...
No doubt the Born rule still needs explanation, but every other interpretation also still needs to explain the born rule, so it's not reasonable to use this flaw to distinguish between interpretations. Undoubtedly, it's related to the fact that the integral square modulus measure is the simplest one that's preserved.
