....This means that Metaspins casino computer automatically checks IP address, computer device, person and household and credit welcome bonus to account.
I've never seen someone disallowed for a welcome bonus based solely on that. Yes they check IP addresses but they usually use that to block users from banned countries. Most of these casinos only check thoroughly if you withdraw after a huge winning or an "irregular" gambling pattern. That is based on the most cases I've read regarding accusation of multi-accounts.
In fact, if you look at TaC metaspins.com then you can see that there is a very small list of limited territories that include countries such as Afghanistan, Cuba, Curacao, Cyprus, Iran, Iraq, Isle of Man, Italy, Malta, Netherlands and its territories, North Korea, Belarus, Spain, Sudan, Syria, United Kingdom and its territories, United States. But if they refer to a violation of the rules of one account- one IP, then it is possible that the player logged into the account, for example, using another provider and, for example, from a mobile phone, and if the player has a dynamic IP, what to do in this case, of course, they may identify the device itself by mac address.