Guess that all of these scam techniques have no correlation with futures or forex. Scammers are everywhere. You can accidentally face futures scam broker or forex scam broker. The matter here is to be suspicious until you will feel comfortable with the broker. You have to pay attention to all the detaisl which you notice from your broker. To my mind, of course you need to check regulations, licenses and certifications. Then you should pay attention to deposits, withdrawals and so on. Futures trading also can be dangerous if you will choose a wrong broker. I guess you should be vigilant all the time. In this case you will be able whether to detect scammers or you will understand that a certain broker is okay.