This question may have been asked before, but I wanted to reiterate.
It occurred to me because when I signed up at a new casino, the odds of winning were quite high. I didn't know if it was just coincidence or if it was designed to win. After using the same account for a while, the win rate decreased. I excluded sports betting.
It doesn't matter if you open a new account, the odd of winning is still going to be the same and this is because it isn't that the casino are against you but it's you that is thinking that the casino are making the odds against you. The more you win is the more you get more comfortable and begin to lose some of the things that made you good at the beginning of betting. Everybody experience this while gambling but it's how you handle it that matters because the casino aren't favouring others while neglecting you as you're thinking. Don't go against the casino policy because you're thinking it'll make you to have a better advantage with a new account.