You should move this thread to the Scam Accusations board if you are accusing the platform of scamming you. This is the first time I hear about TOS rules that state that you have to undergo your KYC, otherwise your funds will be confiscated. However, if that is part of their TOS, and it was part of their TOS at the moment you opened your account, they can always fall back on that and say it's well within their rights to follow the rules. Whether or not it's legal, I really don't know.

Those parts you found from UK's Gambling Commission have nothing to with FortuneJack because they are licensed in Curacao if I am not mistaken.
I suggest you contact the admin and OP in their ANN thread > https://bitcointalk.org/index.php?topic=774929.0 and make them aware of your situation.