Just $5 is enough? IIRC, you need to have at least $100 on your Freebitco.in ballance to remove captcha. I had slightly less some time ago and I had to solve captcha in order to claim.
From my understanding, the amount you need to deposit to get rid of the captcha is different for different users. That depends on your wagering volume and number of lottery tickets you have purchased. More bitcoin you wager, less amount you need to remove the captcha. If your wagering volume exceeds a certain amount, for removing captcha, you don't even need to deposit.
You are right I also check and I was able to unlock few bonuses as I deposit nothing for this my multiply wagering is in very healthy position so now today as I remove captcha this also works ok for me so its mean its different conditions for every user on this faucet apply.