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The Costanza Rule is real, but any attempt to utilize it is a paradox.
Rule: any decision I make is the wrong decision because I made it therefore I should always do the opposite.
But to do the opposite is also a choice I am making and therefore it too will be the wrong choice.
Reminds me of a trolley problem variant I saw once. It went roughly like this:
A trolley is headed for Track A, where a single person is tied to the tracks. You can pull a lever and cause the trolley to switch to Track B, which enters a tunnel that you cannot see inside. Track B might have 3 people tied to the tracks, or it might be free of people. You can't see which.
Two hours ago, a perfect prediction machine inside the tunnel predicted whether you would pull the lever.
The perfect prediction machine is guaranteed to have made the correct prediction. Do you pull the lever?
With no other information on how likely each is, and assuming the likelihood of each prediction stays the same, you should never pull the lever. The expected number of people in the tunnel is 1.5.
If the probability of there being zero people in the tunnel gets above 66%, you should pull the lever every time (the expected number of people in the tunnel drops below 1).
There's no probabilities involved. The machine predicts the future perfectly.
Perfect predictions are also probabilities. In that case it has a 100% chance of 3, given that you pull the lever.