The bot serves as a faucet bot therefore this "generous" bot has serves its nature ( no complaint here, loves to wack up the bot )
From there you need to play real opponents, but if you won 15 straight - you win 1.4 btc ... all with no deposit!
So it is a missleading words there and I suggest you to change some wordings there or else someone might having a wrong perception about it in the future though . Your math is correct though you forgot to take into account that it will be hard to find some player to play up for high stakes and the calculation to win 1.4 BTC in 15 matches isnt really feasible at the moment ( this might change in the future though )