Firstly, confiscation of funds is illegal (unless it is bonus money from the casino). Secondly, I think this issue is resolved through the support service. And it seems to me that the casino itself initiates the solution of this issue through a request of KYC procedure. One IP address for an entire location is a known problem and casinos do not want to reduce the number of their clients because of this. I think this issue is easily resolved (especially if you are not a bonus hunter or something like that).
I doubt that the casinos will taking serious to accounts that aren't earn, instead they will act like nothing happen because the more people loss, the more they earn.
Funny how this things work when you are not making much with your account it might be overlooked because I mean you are not getting traction to yourself.
But the moment you have something big, I mean you have a big cash out to do you will see that the account might be restricted and at that point you will be frustrated.
So it is just better everybody has their different accounts and IP address to avoid sorry situations and circumstances and be safe. Use a different IP address when you are accessing a gambling sites so you won't lose your hard earned money .