You don’t know that. All the workers, including the mysterious “behind the scenes”, have their salary guaranteed, exclusive of gratuity.
No one can prove the dishwashers or laundry staff get a gratuity bonus.
Because of the lack of transparency, I, and many others choose not to participate.
No harm, no foul. Everyone should do what makes them comfortable, but your decisions should be fact based and not
due to internet rumor.