Because if someone starts to be a bother after a couple of beers at the same time there could be someone even more drunk but remains quiet as continues to gamble more money. It would be interesting to know what the official protocol for these situations are.
Casinos may have terms and policies which don't allow them to let a too drunken or intoxicated gambler play at their casino.
They have employees/staff to see and figure out intoxicated gambler by seeing like walking, speech, control and coordination, etc.
I found this site about this information but I don't know that casinos also have these types of rules or not.
https://www.business.qld.gov.au/industries/hospitality-tourism-sport/liquor-gaming/liquor/training/rsa/refresher/unduly-intoxicated/penaltiesAs much as this may be true, it is not the case with every casion, at least the ones that don't care about what you are stuck with, they just want to get the funds off you and then to the next.
We must ensure that all of the mentioned must be regulated and integreated into casinos so it becomes a more coordinated arena for people to thrive if we must help gamblers.