Its really hard to identify those scammers because if someone has intentions of doing scam, they will use better tactics to stay undetected like the predators eating flesh of others. Better to do some research before going with any broker and check their reviews, testing the demo account etc. Regulated brokers might be the option, however there are some examples in the past where even regulated brokers also turned in scam and never paid their traders so we can then add checking brokers reputation and operation years in order to make our search more precise.
