Question for someone who actually knows the details: do Everett/Tegmark really imply nightmare universes (as the article claims)? Or is this yet another instance of the common misconception that "if there are infinitely many universes, then all conceivable universes are realized" (a conclusion which does not follow from the premise at all!)

And by "imply" I really mean "imply", not "imply with high probability". The latter doesn't really mean very much in a context where anthropic principles apply (and we would be utterly arrogant to pretend to understand the full depths and details which anthropic principles would involve in a multiverse setting)