Rewards will be distributed to 10 winners at random.
How can you choose these 10 random people, will there be a public draw or the exchange will choose 10 people?
That's a joke mechanism created by this team. It looks like the exchange site didn't get a lot of demand from the users too. I guess they will be picking 10 people based on their criteria and it will be decided internally by them all.
Without a public vote I would assume the 10 winners were all employees of the organizers.
They are very likely to organize the tournament themselves and manipulate the winners.