I'm not a gambler and never used FortuneJack, but that sounds like something a casino would do--especially a crypto one.

My question is whether OP was gambling with funds he obtained via the bug when he hit the jackpot, and whether that's acceptable or not.  I honestly don't have a hard and fast opinion on that, but it would seem to be that if this was the case (that he didn't legitimately win the money he used to win the jackpot), FJ is in the right.  And that's what their argument is, too. 

What would happen if you were in a real casino and knew a slot machine was broken in such a way that the casino no longer had the edge, and the casino didn't happen to know that.  You use the broken machine to win some money that you later bet on the blackjack table--and you win big there.  Should the casino honor any of your bets?  I really don't know the rules, but it seems sketchy on the gambler's part in that case, because he knows he's playing a broken machine.  Sure you could say, "Well, that's not my problem, it's the casino's" but that doesn't sound right to me.

With what was presented here, I think it's at best way too early to start calling FJ sig campaigners as scam promoters, especially when there are long-standing grudges obviously coming out and the typical mudslinging as a result.  If OP broke FJ's rules, he shouldn't keep the money.  If FJ doesn't have any rules covering such a situation, they should pay out.  I'm just going to see how this goes down.