How much is the minimun for not captcha for roll?.
Until the other day when i withdraw nearly 0.10 bitcoin never see the captcha image, but now i see.
AFAIK, your balance should be greater(double or more) than the roll amount to turn off the captcha. i haven't yet deposited on freebitco.in, i'm going to in few days(small amount) to earn interest as well to turn off the captcha. Until the other day when i withdraw nearly 0.10 bitcoin never see the captcha image, but now i see.
In any case, is it removed automatically or is the user supposed to send a request somewhere?
EDIT: after further research on another topic on bitcointalk.org with the same exact name
: https://bitcointalk.org/index.php?topic=319540.3360I found some claim that you need to deposit an amount greater than or equal to the free rolls amount you have won so far. Other say that you don't actually need to deposit, as long as your balance is greater than or equal to double the free rolls amount you have accumulated. (you can see this info in Stats -> Personal Stats in your account.)
Is anyone aware of any official statement about this, or is everyone just speculating?
Well, the Captcha or not decision is more complicated than that!
Simply having double the balance (due to winnings) of total free rolls does not work because I have free rolled BTC0.00149102, but my balance is only BTC0.00070584 (so my balance is actually less than half my total free rolls
. On the other hand, my total deposits so far are BTC1.33296526. So if the Captcha removal requires a deposit double of the amount of total free roll winnings, then it would make sense. But then again, my deposit is greater than the current balance also. But then again, I could speculate a lot more theories with my total deposits amount 
P.S. I bet someone is wishing I was their referral right about now