Thank you. YouTube is flooded with "systems" to beat these games, but the basic math ALWAYS says "no." Yet, the comments sections are filled with people in huge denial, often citing anecdotes about how they beat the odds and won.
If they did beat the odds, it's due to variance. We don't lose exactly on the trend line. Sometimes we come out ahead. More times we come out behind. And there's no way to predict when that is.
If a casino game could be beaten, they'd change they payouts to make it less profitable so players would still come out behind. This happens with video poker, where the payout table is crucial. (And usually ignored by players, to their detriment.)
The only casino game that can be beaten is blackjack. But to beat it, you have to play perfect strategy, maintain a running count, convert that to the true count, play variances on perfect strategy based on the count, and vary your bets widely when the count is in your favor. And you have to do all of this while not getting detected by the casino staff. Contrary to popular belief, counting cards is not cheating, nor is it illegal. But the casino can "back off" a player it suspects of card counting, refusing to take his/her bets. The math in card counting is easy. Managing the process is incredibly difficult.
So, why don't casinos just get rid of blackjack? Because it's incredibly popular. They also don't like to back off "advantage" or "skill" players because it looks bad. So, they've resorted to other means of drawing in the suckers and discouraging the card counters. Three important changes are (a) game variances, (b) changed payouts, and (c) automatic shuffling machines.
The casinos are offering more "blackjack-like" table games. But these are horrible, with the odds stacked in favor of the house. The house has also implemented rule changes (like eliminating the surrender rule or what you can or cannot double-down on) and payouts. (The worst of these is the switch to 6:5 payouts for blackjacks. This reduces the card counter's edge, sometimes eliminating it and making the game not worthwhile to play.) Finally, some houses have introduced automatic shuffling machines to eliminate card counting. Period.
What about all the other casino games, like craps, roulette, keno, the wheel of fortune, etc.? They're all bad bets with house odds stacked against you. Have fun. Gamble. But you're playing a losing game. Be comfortable with that.