system
A chat on subreddit /r/NoStupidQuestions
human
Because casinos don't like it when players have an advantage. Casinos are private businesses and they're allowed to forbid someone from playing for whatever reasons.
gpt
Not in Atlantic City.  They can't bar you because of counting there.

But that just means they don't often have games with as good odds or deck penetration to make counting worth it.  Just shuffling more often kills a table for counting.