Why not? Of course, there are tons of empty projects. They suddenly appear, don't pay anything to anyone, and disappear just as quickly. But there are also decent projects, for example, Rollercoin https://rollercoin.com/bitcoin-faucet. As for income, I would argue about that, because any amount of crypto you receive can technically be considered income. The project is great and honest, but I wouldn't expect some huge earnings from it. And by the way, Rollercoin doesn't promise that either.