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.
It could be co-incidence, our minds like to find patterns even where there is none. But then again I do not disregard the possibility of shady casinos, if it was some shady casino, it could be their strategy to hook player and milk him after.
There are always suspicious casinos with patterns like this... because they often play at casinos that already have a good reputation, they ignore this thought and consider it a coincidence.
Because if they think that only casinos win at the beginning, then players will not continue playing, but I think many people have wagered millions of dollars, which means they are confident about their luck.