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Gambling is entirely based on luck because even with the strategy you develop to play, there is no way that it will always work for you, so as you are developing your strategy, the next thing you should be doing at the same time will be praying for luck because there are people that don't stress too much...
Ironically, when comes to casinos and games which do not have anything to do with skill but rather only luck, there is more mathematics involved than luck itself, that is why casinos will be always profitable in the long term, as long as they keep a reasonably high volume of people gambling their money on their websites.
If gambling was one hundred percentage only about luck, it would be possible for a casino to go bankrupt, but that is almost something unseen, because before setting all the games and promotions the casino and the staff behind it run their mathematical models and get an approximate idea on how much money they are going to get in a monthly basis. When comes to casino profits, they are not leaving things to be decided by entropy or randomness, money is always guaranteed for the house and the people who depend on the house to keep their livelihoods.