You are right about Betnomi showing user balance in USD which also what Roobet as do but we can't compare Bk8 with them because there's still something skeptical about the OP post and I am going to giving her till Monday to answer the question I ask him.
I don't have any problem with showing the value of usd when you are gambling is not different to gambling crypto. You are still gambling your crypto but showed the value in usd to it is only showing the value and it doesn't mean that you are gambling using fiat and ot crypto.