I think a precise way to explain why I felt like adding "at all" is because I had already restricted myself to thinking about the most extreme spiral-of-silence cases. The Evergreen State-Bret Weinstein fiasco is a salient example. These kinds of situations are where a solution to spiral of silence-type phenomena would have the greatest impact, but I suppose there could be cases where the group dynamic is not as hostile, but still unforgiving enough that people will essentially want to test out ideas in front of their peers before publicly endorsing them, as ring signatures allow. I don't know where such a group could be found or created.

I guess I am having difficulty imagining a group that would be heterodox enough to agree to talk about whatever "unpopular" ideas get endorsed on their ring signature, but would still be orthodox enough that individuals would feel the need to use the ring system in the first place - it seems to me like that would require holding contradictory beliefs about how one's peers would react if you expressed support for a "toxic" idea. I've noticed I have an easier time than most being that person though (and if I'm totally honest, it's a part of my personality that I like, and I probably consciously turn it up), so maybe this is a failure of imagination on my part.