AJ
Fair enough (I searched “cheating” he said “cheat” so i missed it)
Again though, it isn’t that they don’t trust the OU.
Lets use the tuna fish example. R’ Moshe requires each fish needs to be inspected for fins/scales. (Earlier Rav Henkin required the same) The OU under R’ Shachter disagrees and allows intermittent supervision based on chazakah that the fisherman doesnt want to ruin his trade and other factors.
As you can imagine , many “heimish Hashgachas” wont accept OU tunafish. Do they not trust the OU? Of course not, they just don’t accept their standards regarding inspecting tuna fish.