Joseph is correct on this
Anon you said “Do you have proof that the OU can”t be trusted? ” I dont see where Joseph said this. In fact the reverse is true, as the “hemisish hashgacha” DOES rely on the OU. It depends for what.
Even if a Twizzler run is certified by a mashgiach temidi it has ingredients that werent.
By definition when relying on a hechsher you accept certain piskei halacha that you (or your Rav wouldnt hold of) A famous example is OU tuna fish which is not good according to R’ Moshe (who requires each fish to be inspected for simanim) Others argue and thats fine. But by accepting the OU blanketly you are accepting their pesakim. With bishul akum the OU is quicker to label things “aino oleh al shulchan melachim” with Grape flavor there are kulos.
Again and I cant stress this enough, I rely on the OU and in no way is this a criticism. And nobody is saying they cant be trusted, this isnt about lack of trust. Their poskim hold you dont have to check each individual tuna fish, other poskim argue. .
Of course there are probably some chumros the OU has over smaller “heimish hashgachos”