No, but casinos are private businesses with the right to refuse service to anyone, and they tend to exercise that right against people they believe to be counting cards. Card counters are not a protected class.

> the right to refuse service to anyone

If I remember correctly, then that is true in Nevada, but not in Atlantic City. There they have to let you play even if they suspect you of counting cards.

Of course that just means they will employ other means to prevent you from counting cards (larger shoes, continuous shuffling, etc).

As we're here, can someone explain the difference between counting cards vs being actually good at the game of Blackjack?

I've always assumed that the two are really the same thing. If you get good at the game then that implies you're using an intuition for the probabilities of certain events based on the history of the cards.

I suppose the casinos don't have to justify this, or have any moral quandaries about it.

It's not illegal. But the casino is private property, and if you don't follow their instructions to stop counting, and ask you to leave, now it's trespass.

I'm not insinuating anything, it's just a fun story.