system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is "Counting Cards" in Poker Considered as Cheating?

While watching TV a girl in the show got addicted to poker and she got in trouble and the guys she were playing were like "She's cheating! She's counting cards". 

How is that cheating? It is like playing a memory game and remembering what cards you already picked up, right?
gpt
First, you can only count cards in blackjack, not poker. It's not cheating, it just gives you a ~~huge advantage~~ slight edge over a casino. They're in the business of making money, and if you're counting cards, they're losing money (if you do it right). Because they're losing money, they'll kick you out. It's only considered "cheating" by the casino, because it's bad for business. The reason why it's "cheating" is because blackjack is supposed to be a game of chance. You're not supposed to know what cards are coming. If you count cards, you can make educated guesses about what cards will be next, so you can bet big if you know you're probably going to win, or small if you're probably going to lose.

Edit: Reality crushes Hollywood.