Sure they are, otherwise gamblers will complain and that will run their reputation, the only reason why we are not winning is because the odds of winning in slots are very low, personally I don't focus in this kind of game, if it's hard for me winning in sports, the more the difficult here.
Tell me how to prove their provably fairness in one of slot games you know? by their hash? And now, OP is complaining slot games on fortunejack.
You want a real provably fair, better go to casino man but if you want to play online I suggest better to play with a live casino. To be honest, went i play to gamble on a digital i really don't care about provably fair, the code/bot always chasing the user who plays at their site. The best solution, gamble at E-sport of Match game to get a real probably fair, they can't cheat that.
Even you can get cheated on real casino. You can google it and see how many it already happened. Playing on real casino doesn't mean it has 100% provably fair.
How if you don't think about provably fair slots and only enjoy the game?
What do you feel when you throw away your money on scam site? That's what OP asked.
99% of people want to earn money through gambling and only 1% of them who only play for fun only.