When it comes to online games, gold farmers have become a serious threat to online games to the extent that many free-2-play games have hundreds of bots roaming around. The problem with gold farmers is that they ruin the economy of the game. They do not communicate other players, but rather disturb them. Generally, they make the gaming experience of regular players a lot worse. It is not an easy task to fight with gold farmers, because they mask their IP addresses, so you cannot locate them easily, and even after you do so, they come back again after a while. One of the best ways to combat them is to design a game from scratch in which gold farmers would have no interest in due to the mechanics of the game. Zu Online is one of such games that comes to my mind. It had disabled trading of the in-game currency between players, and this has effectively removed gold farmers. Gold farmers are also not a problem in games where there is unrestricted player versus player combat. That is because players can fight against bots using their whole arsenal. The games that suffer from bots the most are those that many experienced players would call carebear.