The 'catch' is that the max bets are extremely low.
I'm guessing the local casinos are all run by the government with job creation is the main motivation for casinos rather than house profit.
In my experience, most players do play basic strategy and thus many, often, get upset at a card counter’s actions that deviate from Basic strategy. Some don’t know it very well, others know basic strategy but when it’s in conflict with their intuition, or their personality, they deviate (splitting 9’s against an 8, hitting or doubling A7, etc).
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