Well, it’s impossible to shift the odds against the house at poker. The house collects a fee from the players and the players take each others’ money.
Blackjack is on weird legal ground, though. My (shaky) understanding is that casinos in NJ can only offer it based on the legal fiction that it’s a game of pure chance, which is why NJ casinos don’t kick out card counters (which would be admitting that it has a skill element), they can only change the game conditions for counters in ways that make them unprofitable. (Limit bet sizes, shuffle after every hand, deal very very slowly…) There were lawsuits about this in the 70s or 80s, involving Ken Uston, but I haven’t researched them in any depth.
