That's only 100 spins so what about 200, 300 or 500 spins? then don't be surprised if we lose $300 in 10 minutes that's normal
In gambling there is definitely more to lose than to win If this situation is reversed, of course we will not be able to see the gambling site go bankrupt
Well sometimes martingale will work but actually not always since all of us have a bad day and we can't rely on what some strat if bad luck strikes so if you don't want to earn more losses then quit better rest than chasing losses since if you keep rolling provably he don't have any money to use on the next day. Also its not good to blame the site which other gamblers do and this kind of act is done by childish person.
It's always fun to try different strategy in gambling, but honestly, martingale is the worst based on my experience, I'd rather choose the flat betting and just be strict in bankroll management, less riskier that way and I can enjoy longer than martingale where anytime your bankroll will be wipe out.