The idea was that the people that put them up NEVER look at them and/or once they get the pokemon they stop while they have their happy "I have a swuper pwerful pokemans that will totaly beat your arceus with origin pulse and precipice blades." moments and leave GTS alone.Why bother?The more rogue trades are successful, the more there will be, you're fighting a losing battle; the more the success, the more people will do it
As for cloning I know it's tedius as hell but with pokemon bank doesn't it go at an exponential rate of cloned pokemon?