I think it will be complicated for them because they have to make a new type of captcha service.
It will be a lot easier to program a bot read the balance and calculate the checksum than it would for a human to do so. It's as complicated as adding half a dozen lines of code.
Yes, it is true.
therefore we still have to add captcha images to create uniqueness
the function of the last digit of the balance is just to make sure that someone who completes the captcha can see the balance of his account
because what happens now is that botnets send captcha that has the same type as captcha used by millions of other sites
the difficulty I mean is for captcha solver companies, which provide captcha workers.
if you accept my suggestion there will be 2 possibilities
# 1. if the captcha coming from freebitco.in is not big enough for their income, they will not adjust to that change and the botnets that depend on them will no longer automate free rolls game.
that way, number of botnets that exploit free rolls game will decrease
the rest are only botnets who have their own captcha workers and for this type of botnets it is certainly 100% of their income from freebitco.in if they only target freebitco.in and this one cannot be kicked using this method*)
# 2. but if the captcha coming from freebitco.in is big enough for their income, then they will adjust the change and make a special captcha for freebitco.in*)
*if this happens then to fight them we must make changes continuously until we find good innovations to fight botnets