It is necessary to add more crypto payment method in order to be more competitive with other casinos and bookies. BK8 is few steps behind in this area compared to other competitors where most other casinos/bookies has more options. Coming up to bitcoin lightning network, I dont think they will add it because it is not popular among bitcoin/crypto gamblers so adding it wont worth the cost. As we all can see, most crypto casinos are not implementing it.
When BK8 was launched there were no plans to adopt crypto into their payment system that's why they don't provide many choices maybe they are considering some things
for example a price drop like this week imagine if they adopt crypto totally of course their asset value will decrease just look at the payment method available today is USDT which is quite safe from asset decline, I predict it will be difficult for BK8 to add more crypto payment.
That should be part or the business where there is always a risk for the casino side. They have adopted crypto as payment method, so basically they are ready for the risk. There is also bitcoin as one of deposit method, means that price changing is not something they are worried about. I also believe there is always a way to minimize the risk of price changing. They can simply use direct conversion of any crypto deposit to fiat like what is implemented by some casinos.