In the long run the losses turn out to be greater than the profits which is why it's not profitable over the long term.
It's easy for beginners to use but they should avoid using it consecutively to avoid losses.
It depends upon difference experiences from the gambler who play martingale. Sometime the gamblers keep on playing with martingale and keep on wining and thinks that this is the best winning strategy in gambling.
In freebitco you can use Auto bet and apply this strategy , and you may start wiing few of the games. But one day will come, when this strategy will fail and you will lose all your balance.
I would like to defend that strategy (a little). It would be great to be able to export rolls history - unfortunately we do not have that option. But having - let's say - half a million rolls or sth like that, and knowing that you bet Hi or Low consecutively, you may look for the longest series to evaluate the pessimistic scenario. Of course it is just a pure statistic, as just next second you may roll serie twice as long as you had in the past. But, statistically, it does not look so bad if you are not too greedy. And I talk about scenario when you have bankroll like 0.02 but play with bets 0.0000002 and 110% increase on lose. That way of course all takes longer, but also the are bigger chances you survive longer.
Yes, yes, I know, each roll is independent, past rolls have no impact on the future ones etc - what I wanted to say is playing quite low bets, you increase your chances.
Seuntjies DiceBot used to give you the full lowdown on your roll history, including basic stats like your longest losing streak and stuff like that. But I'm not sure if that software still works with FreeBitco.in, though. I've seen some reports saying there are problems with the latest release, so you might wanna do some research before you give it a shot.