in forex brokers that kind of thing is usually done, Forex brokers usually hold contests to attract traders, they usually manipulate the winner, the contestants will usually find it difficult to win because it has been planned a fake winner, but not all brokers do that, to be honest i don't know if binance also uses fake winners, because I haven't researched it, that's why I don't really like trading contests, because most companies plan fake winners, it is a classic strategy to attract traders.