Bro you are doing this in a wrong topic section.

And regarding your question.

Ans: - BTC Faucets make money from several sources, Mainly from adverts that they put on their faucet.
You can choose any kinda advert type, From cpm to pop.
You can also add some extra reward/earning features like offerwalls or traffic exchange to your faucet but that will need expert help in the development.

See my faucet as an example - www.zbitco.in