  The mild form of the Weak Gravity Conjecture (WGC) requires higher derivative
corrections to extremal charged black holes to increase their charge-to-mass
ratio. This allows decay via emission of a smaller extremal black hole. In this
paper, we investigate if similar constraints hold for extremal rotating black
holes. We do so by considering the leading higher derivative corrections to the
four-dimensional Kerr black hole and five-dimensional Myers-Perry black hole.
We use a known mapping of these rotating solutions to a four-dimensional
non-rotating dyonic Kaluza-Klein black hole and impose the WGC on this charged
solution. Going back again to the rotating solutions, this fixes the sign of
the corrections to the rotating extremality bounds. The sign of the corrections
is non-universal, depending on the black hole under consideration. We argue
that this is not at odds with black hole decay, because of the presence of a
superradiant instability that persists in the extremal limit. When this
instability is present, the WGC is implied for the four-dimensional charged
black hole.
