In this case, The casino can simply say the fund is lost and cannot be recovered. They don't have to ask for a $200 charge to recover just $50 which doesn't make sense to me. One of my friends works with an online casino and he said if we have access to the fund, we just credit their balance manually. I know all casinos don't work the same way. Let's say the fund is more than $500. In this case, they may charge $200 developer fees to recover the funds and I believe OP would make complaints but he would agree with them to pay the charge.