Thus, CCF is viewed as a class shibboleth because the problem CCF solves extremely well is getting together a group of people with lots of picky eaters who are all different kinds of picky eaters but who all still want good food and you have to pick a place you can all go. You're simply never expected to run into this problem if you run in upper middle class circles but it's a nightmare scenario for everyone else in cities without a CCF and having a CCF in your city solves it in a way that is a meaningful upgrade in your quality of life.
As a result, people vastly underestimate the difficulty of this problem and how poor CCF's competitors are compared to it and how much brand loyalty people who don't have this social coding have towards this company for perfectly logical reasons.
CCF's great accomplishment is not just realizing this but then designing their entire restaurant from the ground up to totally holistically solve this very hard problem and their near monopoly level profits are a reward for their hard work.