That is indeed an interesting point. They excuse themselves from a lot of responsibility in the event that you gamble again with a different account, which from this screenshot alone looks like they do not address their liability in a situation where you are able to wager again through their inability to enforce the ban. While I don’t think that makes them liable, I guess that gives you an angle to try and justify a settlement. I suspect any payment would be made to show their commitment to address gambling addiction and not because they are at fault in any legal sense, which I don’t believe them to be. At best you could say their system malfunctioned and allowed you to gain access to wagers again leading to your losses, but I don’t think that excuses your personal responsibility. They could even argue you were taking advantage of a website malfunction and in essence hacking their system to try and profit.