The basic strategy is a tool serving to significantly reduce the predominance of casinos. Martingale and other strategies of increasing bets, like in roulette, do not guarantee you success. In many cases, you will lose your money faster than you would lose it betting the same bet size.
The only way to make long-term profit in blackjack might possibly be the strategy of card counting.
This is the reason why this game was so popular among the so called "bonushunters". Nowadays, bonus hunting in blackjack is impossible since casinos have modified the wagering requirements for wagers from blackjack and similar games.
When mastering the basic strategy, the loss can be reduced but not to the point that it becomes profitable for you.
This is the reason why you will get some basic strategy for blackjack in the form of a small card when entering a casino. Naturally, no casino would do this in order to make the players win, but it is a good marketing trick to attract more players. Even if the basic strategy is used, the mathematical advantage remains on the side of the casino.