In high-trust social circles, certainly. But the risk of reputational damage still exists when using these channels; this is how whisper networks destroy people seen as insufficiently dedicated to the Cause. Criticize the wrong person or do so insensitively, do it to a person with an outsized ego, and you may find yourself ostracized. Jo Freeman's essay The Tyranny of Structurelessness well describes how such power imbalances can occur and how people suspected of insufficient loyalty can be informally but firmly removed from the decision-making of a group.

This is, after all, why virtue signalling is such a common tactic. It shores up reputational defense against such accusations. Unfortunately, it also commonly has the effect of further deepening the divide between the group and other parties who might otherwise be interested in the Cause, as the most valuable signalling techniques require costly actions - i.e. ones that are materially or socially damaging to the member doing said signalling. This may affirm loyalty, but often harms proselytization efforts (you cannot advance the Cause to your family if you have cut off contact with them for not already being part of the Cause, for example).