Betting strategies are not totally worthless: in the long run you'll lose but you have at least the choice at some point to stop, keeping some profits (given you made anything at all). With a single max bet you don't have any choice.
You usually won't withdraw in time and lose everything anyway but that's another matter xD
I wouldn't use Martingale systematically, or worse a bot based on it. You can use some sort of controlled Martingale starting to bet after long loss streaks and capping max bets to a very safe amount: if the losing streak continues past that you just reset to zero bets (or the closest to that the casinò allow) and wait for another loss streak to begin.
Withdrawing partial winnings and risking only some of the profits from time to time is also a good practice.
You'll still lose in the long run but you can have a somewhat better chance at finding the good moment to stop and keep some
