> In universe-as-a-wave-function there are no probabilities. There are probability amplitudes in the universal wave function, and those are complex square root

> In universe-as-a-wave-function there are no probabilities. There are probability amplitudes in the universal wave function, and those are complex square roots of probabilities. It is true that deriving the Born Rule purely from the unitary dynamics of the wave function is an unsolved problem. This is discussed a fair bit in the comments to Aaronson's article.