john.k, I think you are thinking about the EP additives which have activated sulfur and are not safe for red metals. There are lubes marketed explicitly for use in worm gear drives, with EP additives that are safe for red metals. These are, in fact, the most commonly recommended lubes for worm gear drives, by the drive makers.the gear lube ......which must never be an EP oil.....EP oils kill worm drives.
So "must never be an EP oil...EP oils kill worm drives" is too broad a statement. "EP additives that are not safe for red metals will eat bronze worm wheels" is absolutely true. But there are EP additives that are safe for red metals, and some of them are used in lubes explicitly intended for use in worm gear drives.