Measuring optimization power requires a prior over environments. Anti-inductive minds optimize effectively in anti-inductive worlds.

(Yes, this partially contradicts my previous comment. And yes, the idea of a world or a proper probability distribution that's anti-inductive in the long run doesn't make sense as far as I can tell; but you can still define a prior/measure that orders any finite set of hypotheses/worlds however you like.)

Paperclipper has an optimizing power.

You left out the stage of the argument where it is explained that optimising power is rationality.

Obsessively, and even efficiently, pursuing completely arbitrary goals isn't unusually seen as a pinacle.of sanity and rationality. It tends to get called names like "monomania", "OCD", and so on.