I doubt if there will be any casino with such feature to help gamblers set maximum losses, because if possible some casinos are even to ready to ripe allow all your funds in two seconds if you give them the opportunity to do that, since the more you loss, the more they gain, and as such, every business casino operator will always want to make more profit and pray nobody wins, so that he/she doesn't pay a single cash-out & maximize more profit.
Well said. Casino is not different to any other business, aiming to generate profit (as huge as possible) so they can continue operating their site since it's profitable. That being said, they will not stop their customers to spend more if that's beneficial to their casino. They might warn the gamblers to only spend what they can only afford to lose but the gambler itself is the one responsible for how much they will use to gamble on the casino.
Therefore, it's not the casino's obligation to set limit on how much losses you can only have per week to be out. It's in the gambler's discretion, so if you have no self-control that's your problem and not the casino's fault.
It's an undeniable fact that a person who is addicted to gambling cannot be stopped just by a tool or a rule even if a casino provides that option to them. I wonder why would an addicted gambler not go to a different platform when they feel the urge to gamble and they have set a maximum loss limit for their account at that particular casino and the limit has already been met. So, I don't really find this to be a viable option to avoid excessive gambling at all.
As you said, it's also not the responsibility of the gambling platform to stop a person from excessive and reckless gambling since they know that is what makes them make more money and if they start stopping all their gamblers from doing that, they will have huge plunge in their monthly revenue.