so far, we haven't seen any casino or gambling site that would offer such feature. and it is quite obvious that this is not part of their concern as they would want their players to spend more on their site rather than restrict them.
also, as a player, you can easily monitor your weekly spending habits on gambling by allocating certain amount of your budget that you can deposit on these gambling sites. that alone, you already know how much you can afford to lose in gambling.
Also gamblers shouldn't be waiting on casino to save them but they should be the ones to look after their own self because at the end of the day all the casinos opened because they're looking for money. They're a business and as businesses they have to make profits from gamblers.
It's not the casino responsibility to look after those that came to their platform in search of entertainment or money. The more people gamble using their platforms they more they'll make profits, what he's asking the casino to do is to sabotage their business and they can't.
When gambling we have to discipline ourselves so we don't become a victim of our greediness. Before gambling always have a budget so we don't overspend, whenever we're gambling we should also be watchful of the time we spend in casino gambling and reduce it if it's too much.