First of all, casino isn`t interesting in it. They don`t need to care about addicts - they make money and don`t want to pay for decreasing their profit.
The second - if casino would share other casinos only your wallet - you can create new wallet easily. If they would share your data and wallet - it seems that they would break a law. Also it can be used against gamblers. If one casino will block you or even just restrict in any way - they can share it to other casinos.