Hello,
Andy from the Data Working Group here.  Because of the ambiguity, I suspect that it's best to roll this change back.
Anyone that sees an "amenity=lockers" locally can decide to go and visit it and decide whether it is an amenity=luggage_locker , amenity=parcel_locker or something else.  In some areas the operator might be characteristic, in others it may not be.
I suspect that it's not suitable for a Maproulette task because many or most will need a survey.  Perhaps have a chat with StreetComplete?
Best Regards,
Andy
