Fortunejack has been around for over 6 years now, they started 6 years 1 month ago on this topic and that means it was active a bit before that as well so we can say it is over 6 years old. You can check their history and you will see that there is no big complaints that they couldn't solve, sure there were few who tried to cheat the system and got caught and maybe few who lost money on loss streak and blamed FJ for meddling, but for the past 6 years 99% of people know that this place is great.
They also do great marketing and promotions as well so you could get some free stuff time to time as well. Are there better places? No I do not think so, this is as good as it gets, there are very few that are competing with this place but none that is clearly better anywhere.
Yeah, there is always technical problems in coding world that could screw up at any time, so even if there was one which I doubt there was it could be understandable time to time.
But "money" related ones? There has been zero cases that fortunejack was accused of and found guilty, and in 6 years that is a huuuuge accomplishment.
If it was something else, like maybe your game is glitching or design shows one thing somewhere to you, whatever development type of issue, I would understand it because that kind of stuff happens in crypto world all the time, but we are talking about something financial here and we are talking about accusing fortunejack for stealing basically and why would a place that makes tens of bitcoins every single day steal something so small for no reason? Makes no sense.