Total wagering volume.
According to the following post made by TheQuin, you can also deposit 100 dollar and get rid of the captcha without any need to have big wagering volume.
Thanks.
Finally got some answer about this mystery XD. Don't really know about these, I tough only an old account who have the ability to claim a faucet without a captcha.
I think that still applies. It's been a long, long time since I had to use captcha but IIRC correctly, there was a certain amount you had to wager OR deposit before the captcha applies. I currently don't have a balance at $100 but still works for me, but I'm very close to max freeroll bonus BTC (and that comes from wagering) so I guess I hit the wager requirement. Very sure the explanation is somewhere, just can't be bothered to find it as I don't need it:)
The last I remember you do not even have to "deposit" 100 dollars, just have 100 dollars on your account and that is enough, so let's say you deposited 50 bucks, gambled and won another 50 bucks, that still works if I am not wrong. I have been here for a very very long time and all my income and bankroll has been coming from my affiliates, I have never deposited a single cent but obviously people I brought did deposited (I figured it out from how high they gambled, that can't be free faucet, it is over 100
bucks) but still I do not have captcha.
Probably because I have been around a lot and I have brought a lot of people and so far had probably thousands of dollars in my account that I withdrew so I suppose system recognizes me somehow as well, so depositing is not the only method.