The only one who can verify is admin of the site or the player itself but I think it is still possible to up 1400mbtc in two hours. Lets say he won a parlay by with so huge odds, who knows?Other possibilities, he won many bets in two hours with big odds (maybe around 3-10).
I believe sportsbet will not cheat, so it is not a fake thing. Or perhaps there is glitch on the leaderboard calculation. Have you asked live support about it? I think the live support can confirm about it.

Indeed it needs a huge odds, but it is still possible to win parlay with 70+ odds. Parlay may includes many bets from different days (not only the previous 2-3hours) i.e His parlay includes some bets from yesterday or two days ago matches and the last match has just ended 2-3hours ago. So the main issue here is not the period of time he jump 1400points but about what bets he made that gave him around 1400points.
If there were no many matches during that 2-3hours, so win a parlay bet is the most possible thing that made him jumped to the first position. Even though I believe there were enough matches to bet during that 2-3hours to make 1400points.

Well it's not uncommon to hit parlay bets @ 70+ odds but I do admit that it's rare. What I am more interested in is if multiple single and parlay bets on the exact same lines will count towards the leaderboard rankings or not? Let's just wait for an official statement before calling any foul play here because that player could have just been very lucky and have hit something huge in the last hours.

He/she would be credited 19.99 * 100 * 0.6 because they don't count the wager, only the profit.

In my opinion, there is no harm to all the pope to put the stakes are big so they can have victory over the stakes, if you have not been enough to bet larger, look for another site where many have a chance to win and get the reward ..

Hey,

just to let you know, the player on number one spot on the Premier Leaderboard for November made a successful 7-leg multi bet that won with very high odds. We have asked for permission from the player to publish a bit more info on the bet, but have not received it yet. So once and if we get permission, we will posting more info on this spectacular multi bet on the forum.

#BetBigWinBig

- Sportsbet.io

Hey Sportsbet.io Players,

as promised and with the player's permission, we are glad to disclose a bit more information on the winning Multi Bet that took the winning Punter to the number 1 spot on the Premier Leaderboard for November with one single move!

Here is the mobile screenshot from him of the winning 7-leg Multi Bet Betslip with odds over 297: he staked 5 mBTC and took home over 1489 mBTC and got, very deservingly, the top spot on the Premier Leaberboard. Congrats to our Multi Bet "this is how it is done" Punter!

We are happy! #BetBigWinBig!

- Sportsbet.io

Yeah I was about to ask the same thing too I participated the promotion just yesterday but unfortunately lost the bet so gonna wait for a couple of days until I receive my bet back but now it's gone....

Edit : Talked with support they had to cancel the promo because of a problem from the point spread total.

Lol is that the same problem i reported which was with Totals ?
The odds were not updating and my bet was getting rejected everytime

Edit : Just realized the one I reported was for NFL not NBA