Based On my experience:
F=earnings from free rolls.
D=total deposits minus total payouts.
C=earnings from referral commissions.
E=daily interests.
B=current balance.
X=something that has been changed recently.

C will be counted as D (not F).

E will be counted as D (as someone said that he saw captchas for some free rolls then saw no captchas and again captchas reappeared , the site paid daily interests so captchas removed for some rolls)

We must meet these conditions to remove captchas:
1. B must be at least X.
2. D(+C+E) must be more than F.


X was 30k before, but now I think it's 500k.
Spending some coins in multiply & lottery tickets will also remove captchas temporarily.

So if you deposit 500k , you'll see no more captchas until you reach 0.01 , it takes 7-8 months.