Casinos love martingale players. It's also a myth that minimums and maximum bets are there to prevent Martingale.
Minimums are there because casinos consider bets that are too small to be a waste of time considering overhead, and maximum bets are there because the variance is too high for the casino to handle.
I've never heard anyone claim that casinos set their maximums to prevent martingale. Only that martingale is prevented by maximum bets (i.e., all keyboards have keys, but not all keys are part of keyboards).
Actually i did hear a lot of people saying casinos put max bets because of martingale. Obviously any casino has to have a limit because they dont have infinite money, in online casinos with bitcoin, maximum bets do not prevent martingale or make it worse, it's the same, it does not really matter if the casino has 1 bitcoin max bet or 100 bitcoin max bet