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.
I really do think that it is only a coincidence and that beginners might just have a different perspective when they first started vs when it has been a while. They might have expectations that didn't exist when they just started out that could affect the way they view things.
Perhaps this is also the reason many casinos prohibit the use of multiple accounts.
No. This is to avoid money laundering first of all and secondly, to avoid gamblers from getting the same advantages twice like bonuses or promos. I believe this is also to limit spending amount? Correct me if I am wrong.