Good points.
However, they're not only checking by themself but with the help of their provider. In my speculation, the provider can be stored how the user activity until now everytime there has a problem for some like this most of the time always from sports bet players.
Meanwhile, my self playing livegames withdraw more than a thousand dollar don't have a problem comparing to some sportbet while get caught and their fund got lock who are deposit 150 or 200$.
Maybe the system is the same as what this forum does, for some reason, the forum imposes restrictions on users with devil IP's. Or from the connectivity of blacklisted bank accounts or wallet addresses, all of these can be the reason for how the system blocks accounts. IMO.
But, the case is over, we have seen how BK8 returns the deposit made by the user. We don't need to know how this system detects fraud, because if it were opened in a forum like this, it would become a weakness for the provider.
Well this is something very true, it's like turning a strength into a weakness and it's not the idea either, if we take into account how they did it either by IP detection or anything else, the offender would just do whatever it takes to look for this action and exploit it, but the attitude they take in BK8 seems perfect to me, I don't know if these things are also applied by other casinos, but how they do it seems perfect to me, sometimes people use the same IP, but it can happen the case that several people play on the same IP, connect to the same IP (Public) and from there different people connect to play, which is not bad either, but I think it is not only by IP that can be given.