It seems Op is trying casino games with the possibility of a new account that has a greater chance of winning than an old account that may have won several times.
You are right, that the casino will still get a bigger win. and some reasonable wins are given to users but the comparison will still be more losers. so the casino will still make a profit.
What Op did may have the potential to use multiple accounts which most casinos will prohibit. Op realized that because he tried a new account and got a better chance of winning.
possible rigging up about winning chance specially into those new accounts just for it to make it look that making money with gambling on playing in the site would look easy.
We do know that once a certain gambler would really be having that kind of initial impressions then this is where time that greed would easily kick in. On the moment that they are already
chasing up their loses after some win then this is really something that effective. Just like been said earlier that there's no solid proof into this one, if this one really happens
then pretty sure that would really be tainting out some sites reputation if ever this one would be proven out. People would really be just that only good on speculating on things about those
possible scenarios or probabilities which might actually be happening.