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I've always thought that cheats on the internet are guarrantied not to work, because people always send fake cheats. There are very few working cheats out there - to get real ones you must go to a site which states they try every cheat on their site.
The companies do not do anything about it because they can't, and it is a waste of their time and money. Eradicating this problem will not give them any financial gain, and people can post whatever they want on the internet. The problem will only get better if site hosts try cheats before showing them on their web sites.