There are strategies that start with a small bet. then if you lose a few times, they think you are due for a hit, so they step the bet up a lot. The idea is to recoup all your losses on one win. Then start over.
There are hundreds of systems. Counting is the best ,but not everyone can do it. The others don’t really work, but the player should be entitled to try them.
The casinos love people who use systems like the martingale. Because they don’t work, but the players think they do, so they keep coming back. Casinos would never, ever ban someone with a system like that. Card counting in blackjack is the only system which can you give a positive expectation against the casino, which is why they want to keep real counters out.