From what I've gathered, the only RTP numbers you can get from casinos are from state audits, and those only give you the overall RTP, not for each game. In the past, casinos had to physically open machines and replace a chip to change the RTP. Now, with newer machines, they can do it from their computer systems linked to every machine. They're always adjusting payouts to attract more players. Casinos need to meet state minimum requirements for overall RTP, which can be as low as 80% in some places. Luckily, competition from other casinos usually keeps rates between 88% and 96%.