They do have one gambling token that is listed on their platform and it is
FUN token. I just can't remember when exactly they listed it. But you're right, they should not focus getting listed on binance. There are many reputable exchanges out there like kucoin or ftx. Once their token gets good trading volume on those exchanges and many people demand for binance listing, CZ will definitely notice them and consider to list it on their platform.
FUN tokens got listed on Binance quite a long time ago and way before they were taken over by freebitco.in. it is normal that everyone keeps talking about Binance as they are the biggest and most popular exchange.
But despite being listed in binance, the price of FUN also declines in terms of satoshis.
It means, being listed in the top exchange, doesn't give an assurance that a gambling token will continuously increase its price.
It is also affected by the current market and how the token progresses its developments.
So for me, if betfury will provide more value to their BFG token, that would be best rather than chasing on listing the top exchange.
Because it will easily follow its listing if they are seeing the actual demand of BFG and the interest it is getting from the traders.