I hear you regarding the sister casino issue. That said, this is also a BC.game problem, because their website links directly to BCPoker, so they absolutely need to have some accountability here.
I got the answer for your case, about half an hour ago, where I was busy writing an essay. They found at least eight connected accounts. Seven actually accessed from the same device. I'd like to hear your rebuttal, and based on what the point of your rebuttal is, I'll ask their supporting evidence to disprove the rebuttal.
I think they could just raise a concerned towards connected account without prove and I don't know how possible this could be for them to mentioned what that is not happened on their, and besides I also sense that BC.game may not having to play such shady game by accusing user falsely just to deprived him from having access to his balance is which is in between $1> .
So, I suggest before people try to raise a case or accused casinos they should examine themselves to know whether the fault is from their ends and they didn't obey the most common rules.