system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Whats the difference between counting cards and just being really good at a card game?

I understand why casinos kick out card counters, the casino wants to make money and card counting is "cheating". But if you are able to do it all in your head, is that not the same as being really good at poker? Knowing whats left in the deck and estimating your opponents cards based of that info and by reading your opponent. How do you prove counting vs skill? Is it just a way for casinos to weed out people who would take a lot of money?
gpt
Counting cards is, indeed, just being very good at a game.  It is not "cheating" in the sense of violating the rules.

Casinos kick out card counter not because they are cheating or doing something illegal, but because the casino is losing money on them as so has decided to decline their custom.  Think "we reserve the right to refuse service."  The casinos, which are private businesses, are using that right.