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dankane comments on Causal decision theory is unsatisfactory - Less Wrong
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I am not convinced that this is the case. A self-modifying CDT agent is not caused to self-modify in favor of precommitment by facing a scenario in which precommitment would have been useful, but instead by evidence that such scenarios will occur in the future (and in fact will occur with greater frequency than scenarios that punish you for such precommitments).
Actually, this seems like a bigger problem with UDT to me than with SMCDT (self-modifying CDT). Either type of program can be punished for being instantiated with the wrong code, but only UDT can be blackmailed into behaving differently by putting it in a Newcomb-like situation.
The story idea you had wouldn't work. Against a SMCDT agent, all that getting the AIs original code would allow people to do is to laugh at it for having been instantiated with code that is punished by the scenario they are putting it in. You manipulate a SMCDT agent by threatening to get ahold of its future code and punishing it for not having self-modified. On the other hand, against a UDT agent you could do stuff. You just have to tell it "we're going to simulate you and if the simulation behaves poorly, we will punish the real you". This causes the actual instantiation to change its behavior if it's a UDT agent but not if it's a CDT agent.
On the other hand, all reasonable self-modifying agents are subject to blackmail. You just have to tell them "every day that you are not running code with property X, I will charge you $1000000".
Only if the adversary makes its decision to attempt extortion regardless of the probability of success. In the usual case, the winning move is to ignore extortion, thereby retroactively making extortion pointless and preventing it from happening in the first place. (Which is of course a strategy unavailable to CDT, who always gives in to one-shot extortion.)
And thereby the extortioner's optimal strategy is to extort independently of the probably of success. Actually, this is probably true is a lot of real cases (say ransomware) where the extortioner cannot actually ascertain the probably of success ahead of time.
That strategy is optimal if and only if the probably of success was reasonably high after all. Otoh, if you put an unconditional extortioner in an environment mostly populated by decision theories that refuse extortion, then the extortioner will start a war and end up on the losing side.
Yes. And likewise if you put an unconditional extortion-refuser in an environment populated by unconditional extortionists.