Do not listen to him, nobody has a secret way of making too much money, you can get lucky and hit couple of good runs, there are plenty of people who made good amounts of money from gambling because they got lucky but there is literally not a single person in the whole world that made money with a strategy over long periods of gambling in any casino with house edge.
I do not trust places with zero house edge anyway so that means freebitcoin is amazing and they have proper house edge (5% if I do not remember wrong) which means it doesn't matter what your strategy is and it doesn't matter how right you think you are, in the end you will have that bad streak of losses in a row and lose it all. Maybe not as quickly as others, maybe it will take longer but it will happen.
Gambling always have a risk so there is no guarantee that there is a strategy that would always make you win,
Besides OP is not promoting his/her strategy if we truly read OP's post we would understand that OP is asking our strategy while OP is giving out his/her strategy.
If you use Auto bet with this strategy of OP, then you will lose because the system at a certain point make all the bets in lose and hence on every lose we 2x the amount, which in the end will make our account zero.
However if you are using manual betting, then the OP strategy can be used but you need to play small bets and clear the cookies after every few games. But again it will also not grantee the win.
Freebitco.in is one of the oldest sites and more known for its captha , dice and lottery games. The Win in gambling only comes with luck. If you are lucky, you will win big games and if you are unlucky, no matter what strategy you use, you will lose most of the time.