So far the only gaming token that is listed on mainstream exchanges is the Fun Token. None of the casino tokens were actually listed on bigger exchanges. If BFG will be listed, a lot of them will also be listed. Unfortunately, those casino tokens that were known in the forum already died without seeing the light.
I have the feeling BFG will only be on the DEXES like we see today. The platform is on the brink of success but getting listed will be the hardest which will also hinder this success. And as long as its not going to get more exposure to bigger market, this will remain as is.
Don't forget that FUN tokens got listed on Binance and other exchanges, long before freebitco.in took the project over 2 years ago. Besides FUN, no other gambling tokens got listed on a CEX but in reality there are not so many of them; I can only think of FUN, BFG and OWL.