Not always,there is where they are really useful,help to eliminate robots,fakes, etc., and there is where really only spoil people,or rather hunters the opportunity to earn,and throw them thus,in General, it primarily depends on people,if people are clean and they do not have dirty pomoslov to deceive other people,then everything will be fine,and everyone will earn,as soon as the managers of the thought of others to cheat and make money themselves,then situations begin to occur