Depends on how you look at it but it is possible, tho it might take some time to do so. First you need to rank up here unleast until the full member. Then you can use the library computers to post here once you enter the signature campaign and you'd be earning some amount.

This may be the most simple but the best way to earn something without investing anything (like paying electricity bills at your place ).

But you'll never be able to earn anything without investing something, that will either be money, time or something else.