This is a poor excuse for cheating: "maybe they are also cheating us". Thieves often try to justify their actions by saying saying something like that. It doesn't work. Judges and people overall don't take their words into account. And rightly so. If you think a casino is cheating, stop playing there and open a scam accusation, but don't try to become a scammer yourself.
It's like I killed someone because I suspect he killed one of my relatives or tried to kill me. Even if it's proved that someone killed your relatives or attempted to kill you, you still cannot kill someone. There are laws in each county. You cannot make a decision based on just suspicion. You should have some proof to claim that he is a killer and should be punished.
Now, we don't know if some casinos were cheating on us. It's not easy for players to cheat a casino if they do not have some kind of bonus. If you find a loophole where you cheat the platform, it's not ethical to use it to take advantage. In this case, you are a cheater.