Technically, everyone is right who says that all strategies are useless. Almost every autobetting strategy will inevitably lose at some point...

Note that I did say "almost"...

Assuming the house edge doesn't work too much against you probability-wise, and of course the site you're using has a truly fair algorhythm, I do believe there is a way to guarantee winning using martingale.. It just requires true 50% odds, and a big-ass bankroll...

I won't go into too much detail, aside from the fact that if you're playing with TRULY 50% odds, it is not statistically possible to have more than 30 consecutive losses. So, just make sure odds are definitely 50% if possible, and ensure that you're doubling your bet on a loss AND you have a large enough bankroll to handle 30 consecutive losses, and you're golden.

Aside from the fact that you're pretty much guaranteed to be using such a small bet that real profit would take ages, sans a super duper fast betting bot.