You won't get BCC if you have BTC in exchanges/casinos, or will you?
Many exchanges declared that they will distribute BCC to their customers, but in terms of gambling sites - that's unlikely to happen. Then again, if you hold significant balance, you could get in touch with site operator and ask them nicely whether you could get your share of BCC, if they value you as an investor/user, then there's a big chance you'll get paid.
Not recommended to keep your BTC in casino site except for exchange who offering bitcoin cash there is so many exchange accepted BCC. I do not hear any gambling site who accept BCC, if there is it's good you can store the bitcoin while playing gambling there.