they knew of this situation hours before hand and that they were well aware of the game causing this problem.
if they knew that the game had an error and kept it open then its all their fault and they have to pay.
There is also the fact that verusfides had a good plinko seed. Had he have lost all of his money, he may have decided to redeposit and still end up playing plinko, winning the jackpot. It's not uncommon for gamblers to keep adding more money when they lose.
In my opinion, he should be paid out for the plinko jackpot as it was a legitimate win; there was no bug on plinko. All other losses should be deducted from the plinko win amount. Perhaps all of his Adrenaline bets could be fixed to show the correct winning/losing amount, and have his net loss/profit added to his plinko win amount.
FJ is going to claim he would have not had the funds to make the bet on plinko had he not bet the buggy game 1st. We have no idea how much btc the OP has and whether he would have redopsited on plinko trying to win. The winning bet was rather high(.025btc i believe) and compared to his .0094 initial deposit amount, I would guess the OP would not have been betting .025 bets on his own money.(Obviously i could be wrong but the facts show this to be a reasonable assumption.)
IMO FJ was contacted by multiple players(see quote below) and was aware the game was buggy. How long between the players reporting the bugs and the bug being fixed? Why were the players testing the game with real money? If you're gonna basically run a BETA test, why not use the FJ currency as mentioned by someone before in this soon to be mega thread?
If players are risking real money seems like FJ is saying we are willing to take the loss?
In reality, the OP most likely would not have won a 20btc jackpot on his own funds, but the bug issue is so fucked up I almost think FJ has no choice here but to pay the Jackpot. They took the risk to let the public use real money for testing their new game, they should assume the risks of the events that transpired after his play on the bugged game.