I guess the answer is yes, because you can earn bitcoin using your skills around here, even from signature campaign here, you do not need to invest fiat to have it, just your time and skill you can have bitcoin in your wallet, it just takes time.
Right, skills is a must if you want to earn without investing just search here in the forum and you will find various ways on how to earn. and if you dont have the skills there are always time to improve yourself in specific nature of work. like me, i learned about editing by self studying now i can use it to earn.