It is called luck because it occurrence is not frequent and I believe because winning gambling or bet isn't often that is why it is associated with luck. Therefore, to be lucky you have to make attempt on the gambling. Some people say don't concern your mind on whether the owners of gambling business do manipulate it or not but concentrate your energy and effort on winning either through luck or whatever means. Playing gambling is luck base and so we have to play with reasonable caution so that even when the luck does not come to us and we lose, we can still be fine and not feel bad all day.
If the casino influences the outcome, then luck will never help you, because everything will be in the hands of someone who can manipulate the results. The dealer can be on the casino's side and the player will not suspect anything, it seems to me that cheating can be widespread, to some small casinos where they do not value their reputation very much, but with large casinos everything is different and reputation is very important to them, so they mainly make sure that the players play fairly, and in this case, luck will be decisive.