I don't know if there is any place in the world where claiming 0.023 per hour is more profitable than actually doing something. Even if you are not an adult and can do the easiest and most basic thing, you'll find someone anywhere who will pay you more than that. I'm sure that the only way for it to make sense is to get referral bots that will claim for you.
I agree with you, they gained popularity with their faucet and not with their casino. Btw the minimum withdrawal is 0.00030000 BTC, it will most likely take someone more than 1000 rolls to collect that amount of Bitcoin from Freebitco's faucet.
As I said, there are people from different countries who don't have jobs and are trying to make money from the internet. Even a 12-year-old can try to make some money from the internet, and they think 0.023 can turn their luck! Whatever you think, there are people who still search for a casino that has a a free faucet system, and people even manage to withdraw from the faucet money.
I remember we tried to withdraw from faucet/rain on several websites, and I think I have done this before. As long as there is a chance to make money for free, people would give it a try no matter how small the amount is.