There's also the continuous collapse theory that assumes you start with a mostly classical gravity system and then just reach a runaway where the internal press

There's also the continuous collapse theory that assumes you start with a mostly classical gravity system and then just reach a runaway where the internal pressure can't keep up anymore, followed by the space time well getting rapidly stretched towards beyond an event horizon, making it so that due to finite propagation speed of this concentric ripple in space time, the further in you start, the sooner the distance left to the first spacetime outside for a fresh photon increases with time passing instead of decreasing, because the space time between the photon and outside continues to stretch fast enough to cause "beyond-infinite" red shift.