It is obvious that since financial risks in the currency exchange are hard to diversify, only the most competent and successful players survive here. On average, the broker's potential is revealed after 3-5 years of regular trading. No matter how successful it may be, it must not be considered reliable until that moment.
Fraudulent companies do not last long because traders quickly realize that they are not a good broker. If, when comparing Forex brokers, you see a company that has crossed the 10-year threshold of existence, it is almost always a guarantee that you have a reliable and trusted partner.
These brokers also do not last in operation as state authorities are alerted to such activities and the negative reviews in such a volume would indicate to traders not to use them.