The option to withdraw bitcoin in bk8 is up again now, they put it back few days ago as you can read in this
post. I think you can remove it from your grey list now or at least change the feedback because players are now able to deposit and withdraw BTC.
Thank you for posting feedback, and sorry for noticing this later.
I will remove this casino from grey list if this is true but can you please post some evidence for this, or some other member can confirm this because I don't have BK8 casino account.