Most of your reputable casinos - 32Red, Trident Lounge, etc., watch for out of the ordinary depositing or playing behaviour. It's tough though, since how is a casino expected to know how much is too much? Some players pooh pooh the thought of losing $10,000 a month; some players are in serious shit by merely losing $50.
On the other hand, I'm sure there are a number of clip shot joints that target these type of players. The casinos that account to no one should be seriously avoided. Problem gamblers are in danger there.
“Too much of anything is bad, but too much good whiskey is barely enough.”