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Since begining.
But, I hope they add more prize leaderboards up to 10 users. Since for current leaderboard contest only for top 5 user, Imagine the leaderboard show up 10 user but the winner only 5. You're happy to see your name in the leaderboard, but don't get any prize ~XD.
Let's go BK8.
Looking at the top 5 prizes, it worth a lot of money. There is a car (Honda Civic RS) for the 1st winner, but of course it will be very hard to compete with whales who can wager a lot of money in monthly basis. Adding more 5 winners to make it 10 winners is nice and I dont think it is a big deal for bk8 as I believe it will also increase the wagering activity from players to compete for the 6-10th prizes.