Are we talking about the same site because I've done millions of rolls on FBC now using auto (which is actually by the way one of the fastest autos if not the fastest on my connection).
Even on manual, which I do for games like Blackjack or Roulette at top speed,,, easily easily 2000 in a few hours:) Have easily seen >15 streak on roulette black/red!
It still doesn't matter. If you gamble only 400 times, with 52.5% loss probability, an 8 loss streak is 66% chance, it is super high chance, and I mean just an 8 loss streak chance here, when you go to 10 loss streak that is 25% which is still quite high, 12 loss is around 7.8% which is still incredibly possible, and at around 15 loss streak it is 1% which is I get it not "common" but it is literally 1%, in gambling we have seen how many times 1% can happen.
So long story short this is just 400 times, and even with that there is a HUGE chance you could face these type of stuff, maybe even two big streaks in just one sitting. I do disagree with the 400 bets per session, I think around 1k is more common these days, but even with that in mind, I only tested it for 400 and this is the odds, which means that it is more common to lose money on martingale than people imagine.