Changing patterns is not necessary for them as the house edge is already enough for them to win most of the time. Plus, they could limit your bet, so overall, they won't really lose. If we are lucky, we are lucky, but the law of averages means that eventually, we will lose, as games are not designed in our favor. Sometimes we overthink, and I think it's wrong because, in the first place, we already know there's a house edge, and no one can beat the house edge in the long run.
Yes, I agree with you, that the game is not designed to benefit us, but rather to benefit the house or dealer. Even if we can win, it is only occasionally and is rarer than wins obtained by the house or dealer. If they designed the game to benefit gamblers, it seems like from the start they would have opened social foundations and so on for worthy people to help. For example, in a week I gamble, I can only win a few times and even if I win, it can only cover the amount I lost. From there alone we can realize that we experience defeat more often than we win.
If the pattern of gambling to win really exists, then it has been solved. Even though they may change it every time, now there is a lot of technology that can read game patterns that can make us win. But unfortunately this is just a hope, in other words the pattern grows because someone has a high desire to win.