Their provably fair is actually not provably fair.
If this does indeed turn out to be the case, it is no longer debatable whether or not FortuneJack is a scam and those promoting it should take appropriate action immediately for the good of the forum. Thank god FortuneJack, Lauda & Hhampuz werent able to quickly silence the user making complaints, otherwise this may have never been discovered.
I'm very certain that it is the case, but that doesn't mean they did it in malice. I'm betting that the flawed provably fair system was due to incompetence, and not malice. All other provably fair games should be provably fair. It's not too rare to see a new casino have a flawed provably fair system.
The correct and non-scammy thing to do here is for FortuneJack to refund all users who had losses playing Adrenaline, as they could have been cheated, while allowing those who made a profit to keep their profit (excluding those who profited from the always win bug however) as they made a profit when the casino could have been cheating, which is fine.
You're a overreacting a bit I think. If FortuneJack does not void all plays on Adrenaline (inline with their own policy of "All wagers and bets shall be void in case of a system failure. The original wager shall be refunded.") at the minimum (optimally they should let those who won keep their winnings), then it might be worth calling them a "scam".