Not always. Some casinos cheat and the owners are found at the bottom of some lake and the casino cleaned out.
Discussion
My point is that the casino always systematically wins (in the general sense over the customer), never said the owner or employees or mob.
Thats quite apparent, since the calculation of probability is quite simple to understand, however the point being that not all winning is honorable.
Although there are casino games where you don’t play the house but other players, from which the casino only acts as a good host.
Somehow not playing the house appears to favor the player.