 The thought here is that the transmission model illegitimately assumes a dynamical “starting point” to any grounding chain. If we abandon the transmission model and the dynamical view, we arrive at the idea of indefinitely descending ground whereby all facts have a ground and hence there are no fundamental facts (Bohn 2018). This violates even the weakest of the three requirements that a metaphysical foundationalist might impose, so it is a strict denial of  (MF).  Note, however, that this concerns only the precisification of (MF) in terms of grounding. So, this type of metaphysical infinitism targets the conception of fundamentality as ungroundedness (as specified in terms of  (RI)  in  section 1.2).