Yes, it's possible if he's a big depositor that they DO pay him - for now. Remember the 1668/JAZ sites are essentially a confidence trick and whether they pay is based on the player's record and losses accrued to date. If they judge they're likely to benefit from APPEARING to look after him then they will - the BS will start when he wins very big or gets significantly ahead. Put it this way, if one of you reading this had made a first deposit of only say 100 there and built it up to 50k+ then you'd have more chance of shitting Krugerrands than being paid out.
The rogue terms would come in, like 'we reserve the right to limit withdrawals to 5x the player's net deposits' OR 'issues' would occur with verification. Then you complain and the account's locked. I'd tell this player to think VERY carefully about that casino!