All brokers must be regulated and licensed by the government authorities in their countries responsible for this activity. Scam brokers are not regulated and because they are not answerable to any authority, they are at liberty to steal traders’ funds either by sharp practices on the platforms, non-fulfillment of withdrawal requests, or account closures without refund.

It's very easy to spot a scam broker. Check their regulation and verify it to the regulatory bodies, there you will know if their claim is legit or not.