The days are gone where we could easily get huge amount of free bitcoins from faucet sites and now if you are looking for absolutely free bitcoins then you will not find any single method to get it and if you want to have bitcoins in your wallet then only way is to work hard to get it.
It's better to say that you can get free satoshi's instead of saying free bitcoins from the faucet. And you are right with it, when we say about earning for free, there's no way to earn as free, you need to work hard for it. Maybe there's no investment included but your hard work which is going to generate earning from it.