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).
Saying confiscating of funds is illegal may not be completely true because some casinos would have stated it clearly in their terms that in situations where they find out that a certain person has got too accounts probably traced to their IP or the identity in Case where KYC is done, such account will be faced with the consequence of confiscation even with funds in them, so such casinos who's got such policy will not see or bear such as illegal but if this isn't the case, then considerations could be made on a different terms.
Thats why there's sites terms and conditions on where everything is really that stated on there. If it turns out that there's nothing you can find about confiscating someones funds or deposits
because of multiple accounts or IP's then it will really be just that having that exemption or simply it would really be just that fine on doing so. If you do sees out that there's such rule
about it then better not to risks on making up multiple registration of the said site but of course there might be some exemptions and its not bad on trying out to ask some permission
whether they would really be allowing it or not, but i do have that feeling that they wont be caring about as long you arent that doing something stupid then they wont really be that strict at all.