  The authors of arXiv:1610.01533 have recently proposed a stronger version of
the weak gravity conjecture (WGC), based on which they concluded that all those
non-supersymmetric AdS vacua that can be embedded within a constistent theory
of quantum gravity necessarily develop instabilities. In this paper we further
elaborate on this proposal by arguing that the aforementioned instabilities
have a perturbative nature and arise from the crucial interplay between the
closed and the open string sectors of the theory.
