Yeah, you're right. Betfury won't add such coins because this idea is looking too risky for them. I mean that shitcoin may turn out to be a scam at any moment, and it would negatively affect the reputation of the casino in the future.
So far all the coins they are adding are all good and with good potential in the market, they will not add shitcoins here some of the coins listed in the staking rewards are old coins with volume and liquidity, this is for me a good source of Tron which is making a pump now in the market.
I do not really see shitcoins as problem neither. Obviously there is a cost to adding new coins, it is not going to be simple and you are doing a lot of development plus a lot of maintenance and maybe even your own node etc all of that which would make it a bit harder for the business to manage.
However from the customer side I can say that they could had 1000 different coins if they want, as the casino is a business I wouldn't mind things that doesn't matter to me, like for example they add 1000 coins, if I am using just 3 coins, why would I say bad things about the other 997 being here? I wouldn't care, as long as they have those 3 coins, they can add any extra they want. Which means it is not about shitcoins they may or they may not add, it is about good coins, as long as they do those, that means we are going to be fine even if they add shitcoins as well because we would just ignore.