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Dude, do you have a problem with Duelbits? You need to give a proof about your problem otherwise you're talking non sense here.
Even skill based games require a little bit of luck and more amount of skill for the game to be won. Luck is necessary in gambling.
Although there is no skill involved in luck based games but if we have the skill of money management then we can try to reduce our losses.
Knowing what amount to bet for the particular game and reducing it in the following games is a skill in itself which has helped me limit my losses quite often.
Yeah, poker is one of example of skill based games where you got random card and it's based on luck.
Usually people mentioned skill or strategy in luck based games are about money management, either flat betting (betting with same amount) or martiangle (doubled betting amount).