Bitcoin faucets are a type of website that give away small amounts of Bitcoins to their users.
Faucet owners make money by placing ads on this highly engaging websites.
You can build a bitcoin faucet within 10minutes using a blue host account or install a Bitcoin word press plugin.
When a faucet is made, you answer captchas right? As far as I know, they also earn form that captchas. And when you are having a cash out out of their site, they have a fee from it, I guess they deduct some from that. All in all, bitcoin faucet sites earn also a lot if there are many users, the many users, many owners of other sites will be putting their ads into that site, earning more money.