Casinos are always a scam, you can’t win, and if you find a way they kick you out.

It’s allowed because they can do whatever they want. It’s their table and their cards. As long as they don’t welch on payouts that you’ve already earned, they can kick you out for any reason (except belonging to a protected class), or for no reason.

Private business

If you go into a Walmart and start talking to employees about unions, you’ll get escorted out.