Do you think a gamble site with reputation like BC.game will delay your withdrawal just to encourage you gamble with the balance which you have in your account. If gambling sites without reputation or scam gambling sites delay your withdrawal, then I will agree with you that maybe they just want you to gamble with the money left in your wallet, because if you are unable to make withdrawal, then you might be tempted to keep on gambling, and you might end up losing the money, but BC.game is a reputable gambling sites, so i don’t think they will do that, maybe their was just a mixup and that was what caused the delay in your withdrawal.
When a user want to withdraw money but can not get it approved asap, it does not mean that fund will be used for gambling. It is only usable for gambling if the withdrawal request was rejected (not delayed) but it's not this case.
Additionally, there is so litle chance that a user will change from "wanting to withdraw money" from "betting more" after all.
Lastly, it's important for a company to defend its reputation that takes a long time and many initiatives to gain, than wanting to gamble and risk their reputation by trying to delay or reject a user withdrawal with a possibility of more bets from the user.