Regarding RCBC,
Having worked in kashrus, I can tell you it’s shvach. Cholov yisroel places with workers drinking dunkin donuts coffee and ou-d items on the shelves. One mashgiach for 4 restaurants. Relying on eish m’eish l’chatchila. No locks on the gas. No separate fish keilim. Whatever the OU and Star K does, they don’t do.