Since I started gambling, I have never been blocked on any casino before, the things know bring problem to an account is when you are abusing the casino with your activities, once they notice such abuse and violations you get locked even while their are investigating your account activities.
Your point is reasonable, but the few people who have faced this issue are almost all Nigerian. At first glance, I do not consider it a problem, as a few days ago bitz only brought a new update for Nigerians. And in this context, this problem has arisen. However, there is no longer this problem now, so there is no need to be concerned about it.
As far as I know, using a VPN on minebit does not allow account access, but it is different in the case of bitz. However, according to the TOS, it is better and more effective not to use a VPN.